How much is the daily charge of ore carrier
Publish: 2021-04-24 07:27:18
1. Firstly, the cost of bitcoin mining can be divided into three parts:
1. Machine cost: the cost of purchasing mining machine
2. Power cost: the power cost consumed by machine mining
3. Auxiliary costs: personnel maintenance, network, cable consumables, heat dissipation, etc.
for a simple example, take the mining machine of ant S9, which consumes less power on the market, for example, the calculation power is 13.5T, and the power consumption is 1400W
when the mining machine runs for 24 hours: 1.4kw * 24 = 33.6 degrees
Shenma m3, which consumes more power on the market, has a calculation power of 11.5t, The power consumption is 2150w
under 24-hour operation, the power consumption of a single machine is 2.15kw * 24 = 51.6oc
which is roughly equivalent to the power consumption of energy-saving air conditioning, but the bitcoin miner needs 24-hour uninterrupted operation, the power consumption of a single machine is very large after a year's calculation, and the step price cost of household electricity is too high, When the market is not good, the income may not be enough for the electricity expenditure, so at present, mining will choose to be hosted in the mine, which can get cheap electricity and rece the cost price of mining. The price below 30% is the ideal price, which can keep the price of bitcoin falling to a low level, and there is still some income< According to the current mining difficulty of bitcoin:
BTC revenue per ton: 1th / s * 24h = 0.00007087btc
calculated by the comprehensive 12t machine computing power, the daily output is:
0.00007087t * 12t = 0.00085044btc
then the time required for a single machine to dig a BTC:
1 / 0.00085044 = 1175 days
the time required for ten mining machines to dig a BTC:
1 / 0.0085044 = 117 days
100 days In other words, according to the current difficulty, it takes about three years for a single miner to proce a bitcoin, 3.9 months for ten miners to dig a bitcoin, and 11.7 days for a hundred miners to dig a bitcoin. The cost of a single miner is about 8500, Ten are around 85000, one hundred is 850000, less than one million, and one month's income is more than two bitcoins. According to the current price of bitcoin, the price is about 120000. So, although the income of bitcoin mining is not as good as before, it is still considerable compared with other investment projects
however, these benefits do not include decting the cost of electricity charges and later maintenance of machines, so the premise of mining is to find a mine with low electricity charges. If the quantity is large, we need to find a safe, reliable and stable mine. What's more, we need cheap electricity to lower the cost price.
1. Machine cost: the cost of purchasing mining machine
2. Power cost: the power cost consumed by machine mining
3. Auxiliary costs: personnel maintenance, network, cable consumables, heat dissipation, etc.
for a simple example, take the mining machine of ant S9, which consumes less power on the market, for example, the calculation power is 13.5T, and the power consumption is 1400W
when the mining machine runs for 24 hours: 1.4kw * 24 = 33.6 degrees
Shenma m3, which consumes more power on the market, has a calculation power of 11.5t, The power consumption is 2150w
under 24-hour operation, the power consumption of a single machine is 2.15kw * 24 = 51.6oc
which is roughly equivalent to the power consumption of energy-saving air conditioning, but the bitcoin miner needs 24-hour uninterrupted operation, the power consumption of a single machine is very large after a year's calculation, and the step price cost of household electricity is too high, When the market is not good, the income may not be enough for the electricity expenditure, so at present, mining will choose to be hosted in the mine, which can get cheap electricity and rece the cost price of mining. The price below 30% is the ideal price, which can keep the price of bitcoin falling to a low level, and there is still some income< According to the current mining difficulty of bitcoin:
BTC revenue per ton: 1th / s * 24h = 0.00007087btc
calculated by the comprehensive 12t machine computing power, the daily output is:
0.00007087t * 12t = 0.00085044btc
then the time required for a single machine to dig a BTC:
1 / 0.00085044 = 1175 days
the time required for ten mining machines to dig a BTC:
1 / 0.0085044 = 117 days
100 days In other words, according to the current difficulty, it takes about three years for a single miner to proce a bitcoin, 3.9 months for ten miners to dig a bitcoin, and 11.7 days for a hundred miners to dig a bitcoin. The cost of a single miner is about 8500, Ten are around 85000, one hundred is 850000, less than one million, and one month's income is more than two bitcoins. According to the current price of bitcoin, the price is about 120000. So, although the income of bitcoin mining is not as good as before, it is still considerable compared with other investment projects
however, these benefits do not include decting the cost of electricity charges and later maintenance of machines, so the premise of mining is to find a mine with low electricity charges. If the quantity is large, we need to find a safe, reliable and stable mine. What's more, we need cheap electricity to lower the cost price.
2. The standard of charge is different. At present, domestic mining machinery manufacturers and trading platforms basically adopt the way of mining machinery trusteeship. You only need to buy their cloud computing power to mine. Equipment installation and deployment are completed by them, which is much more convenient, but you need to charge a certain handling fee as management fee or mining machinery trusteeship fee. Of course, there are also some special miner trusteeship merchants, you are responsible for purchasing equipment, they are responsible for the installation and mining, trusteeship your miner, but you need to pay the management fee.
3. As of the completion of proction rection, LTC price is $104.48.
4. Hello, I want to ask, isn't there a stone in it that can push and smash the police, and will come out of the police car?
5. There are several reasons for the slow network speed:
first, the network itself problems
the server where you want to connect to the target website has insufficient bandwidth or excessive load. The solution is very simple, please change the time period or change the target website< As we know, twisted pair is made up of four pairs of wires tightly twisted together according to strict regulations to rece the influence of crosstalk and background noise. At the same time, in t568a standard and t568b standard, only 1, 2 and 3, 6 wires of twisted pair are used. Among them, 1 and 2 are used for transmitting, 3 and 6 are used for receiving, and 1 and 2 must come from a winding pair, 3 and 6 must come from a winding pair. Only in this way can crosstalk be avoided and data transmission be guaranteed. In practice, I found that there are great hidden dangers in the network cable which is not made according to the correct standard (t586a, t586b). One is that the network speed is very slow at the beginning; The other is that the network speed is normal at first, but after a period of time, the network speed becomes slower. The latter situation is very obvious on desktop computers, but the network speed is normal when checking with laptop computers. For this problem, I have found that the network speed slows down e to the network cable not made according to the correct standard, which is also related to the quality of the network card. Generally, the performance of network card of desktop computer is not as good as that of notebook computer. Therefore, when troubleshooting with switching method, using notebook computer to check the network speed is normal can not rule out the problem that the network cable is not made according to the standard. We now require that all network cables should be pressed according to t586a and t586b standards, and laptops should not be used to replace desktop computers when detecting faults< Third, there are loops in the network, which lead to slow network speed
when the number of nodes involved in the network is not many and the structure is not very complex, this phenomenon rarely occurs. But in some more complex networks, there are often rendant spare lines, such as inadvertently connected will form a loop. For example, the network cable from the network center to the computer room 1, and then from the computer room 1 to the computer room 2. At the same time, there is another standby line from the network center directly connected to the computer room 2. If these lines are connected at the same time, it will form a loop, and the data packets will be sent and checked continuously, thus affecting the overall network speed. In this case, it is difficult to find. In order to avoid this situation, we are required to form a good habit when laying the network cable: the network cable should be clearly labeled, and the place where there are spare lines should be recorded. When this kind of fault is suspected, the method of partition and subsection is generally adopted< Fourth, the network speed slows down e to the broadcast storm caused by the hardware failure of network equipment
as the main means of discovering unknown equipment, broadcast plays a very important role in the network. However, with the increasing number of computers in the network, the number of broadcast packets will increase dramatically. When the number of broadcast packets reaches 30%, the transmission efficiency of the network will decrease significantly. When the network card or network equipment is damaged, it will continue to send broadcast packets, which will lead to broadcast storm and paralyze the network communication. Therefore, when the network equipment hardware failure will also cause slow network speed. When such a fault is suspected, the replacement method can be used to replace the hub or switch to eliminate the fault of the hub equipment. If there is no fault in these devices, turn off the power supply of the hub or switch, test the involved computers one by one with the "Ping" command under DOS, find the computer with the faulty network card, and replace it with a new network card to restore the normal network speed. Network card, hub and switch are the devices that are most prone to failure and slow down the network speed< In fact, router WAN port and LAN port, switch port, hub port and server network card may become network bottlenecks. When the network speed becomes slow, we can use the network management software to check the data flow of routers, switches and server ports ring the peak hours of network use; You can also use the netstat command to count the data traffic of each port. According to this, we can confirm the location of network data flow bottleneck and try to increase its bandwidth. There are many specific methods, such as changing the server network card to 100m or 1000m, installing multiple network cards, dividing multiple VLANs, changing the router configuration to increase bandwidth, etc., which can effectively alleviate the network bottleneck and maximize the data transmission speed< (6) the influence of worms slows down the network speed. This kind of virus causes the infected users to send out e-mails as soon as they surf the Internet. The virus selects the random documents in the user's personal computer and attaches them to the random address of the user's address book to send e-mails. Hundreds of such spam are sent out in line, and some are returned to the server in batches. Some backbone Internet appear obvious congestion, network speed obviously slow, make LAN nearly paralyzed. Therefore, we must upgrade the antivirus software in time; In order to improve the security and reliability of the system, the computer should also upgrade and install system patches in time, unload unnecessary services and close unnecessary ports< (7) excessive use of firewalls can also slow down the network speed. Needless to say, only one powerful firewall will be reserved after unloading< 8. System resources are insufficient. You may have loaded too many application programs to run in the background. Please load the software reasonably or delete useless programs and files to free up resources to improve the network speed
optimize your broadband to double the speed of Internet access
before optimization, you can use "Ping" to understand the relevant network parameters, or use relevant software to detect the network speed, such as "TCP optimizer"
optimize the registry (it's better to backup in advance in case): the modifiable key values are as follows: maxmt: modify the maximum transmission unit; Defaultrcvwindow and defaultttl: set the buffer size of transmission unit and TCP / IP packet lifetime; Set DNS query priority: improve the browsing speed of web pages; Improve the ram used by TCP / IP: increase the buffer used by TCP / IP to improve the data rate
release reserved bandwidth: log in as an administrator and run the command "gpedit. MSc" to enter the "group policy" window. Click "computer settings", "management mole", "network" and "QoS packet scheler" in turn, then select "limit reserved bandwidth" on the right, right-click and select "properties" to open its property window, and change the corresponding value of "limit bandwidth" to "0" to release the reserved bandwidth
optimization software: take TCP optimizer as an example, first click "maxmtu" to check the relevant parameters of the network used by users. However, when we enter the address of the website, we'd better choose the address of the local ISP instead of its default address; The same is true for "latency Ping". In the "Settings" tab, we select the type of Internet Modem we are using, then select "optimal setting" at the bottom of the above interface, and then click the "apply changes" button to restart the computer. In fact, there are many ways to speed up the computer, but there are always some dangers, which is also the reason why many people don't move their hands. Here, I'd like to introce a fast and safe method. The method described below is just the reasonable setting of the machine. There is no need for any physical transformation of the machine and the use of complex third-party optimization software. You can rest assured to see it. There are so many settings for the computer. Just after starting the computer and waiting for the memory to be detected, press the "del" key. At this time, the screen will flash and enter the heart of the computer: "BIOS" setting screen. Don't underestimate him. He controls your computer completely. Let's take off this "heart" together! On the front page of BIOS settings, we enter the "advanced BIOS features" option, move the cursor to the "frist boot DEVICD" option, and press "pageup" and "pagedown" to select. The default value is "floppy", which means that the system will read the boot information from the floppy drive at boot time, which is not applicable to our normal computer, Because it's the age of Windows 9x now, there's no need to start the disk normally, so it's futile to read the floppy drive every time you start, and it will prolong the startup time of the machine and shorten the life of the floppy drive. So we have to choose "hdd-0" to boot directly from the hard disk, so that the boot time is fast. Return to the home page and select "advanced chipset features". The settings in this option have a great impact on the acceleration of the machine. Please pay more attention. Change "bank 0 / 1 DRAM timing" from "8NS / 10ns" to "fast" or "turbo"“ "Turbo" is faster than "fast", but it is not stable. It is recommended to choose "fast". If the memory quality is good, you can choose "turbo" to try. If it is unstable, you can change it back to "fast". Looking down, you can see the "SDRAM CAS latency" option. For those with good memory quality, it is best to choose "2", but based on stability, it is recommended to choose "3". In the next is always "DRAM clock", this allows you to run the memory at a given high clock frequency, "66 changed to 100" or "100 changed to 133". Now most of the memory is PC133, so you can change it safely. It's all like this: "if it's unstable, it can be changed to the original state." Note: some versions use + 33, which means the same.) Newer motherboards all support agp4x. If your graphics card also supports agp4x, then activate it in "agp-4xmode", that is "enabled", which will give better play to the ability of the graphics card. Remember, if you support both, don't waste it Note: the activation of 4x is not a single problem, but here is just a prerequisite for opening 4x. I'll have a chance to analyze it with you in detail later.) the next item is "AGP aperture size", which is the number of system call memory as video memory. With the graal popularity of large video memory graphics cards, this option has no great significance. After testing, 16m, 32m, 64M, There is almost no difference between 128M and 16m. Even if 16m is less than 2% different from 128M, don't let too much memory wait for useless tasks. Just liberate them and choose 16m or 32m. In fact, there are many settings in the "BIOS", but the effect is not obvious. So let's put them down first, announce the end of the "heartwarming action", select "save & exit setup" and press "Y" to restart. After the "heart pinching action", the machine successfully logs on to windows. At this time, do you feel that the startup of the machine and the running of the program are much faster than before, but it still can't meet our needs. Because Windows doesn't seem to be very obedient, the setting of windows itself is not optimized. Let's conquer it by ourselves. As soon as you enter windows, you will see the machine blindly open the resident program
first, the network itself problems
the server where you want to connect to the target website has insufficient bandwidth or excessive load. The solution is very simple, please change the time period or change the target website< As we know, twisted pair is made up of four pairs of wires tightly twisted together according to strict regulations to rece the influence of crosstalk and background noise. At the same time, in t568a standard and t568b standard, only 1, 2 and 3, 6 wires of twisted pair are used. Among them, 1 and 2 are used for transmitting, 3 and 6 are used for receiving, and 1 and 2 must come from a winding pair, 3 and 6 must come from a winding pair. Only in this way can crosstalk be avoided and data transmission be guaranteed. In practice, I found that there are great hidden dangers in the network cable which is not made according to the correct standard (t586a, t586b). One is that the network speed is very slow at the beginning; The other is that the network speed is normal at first, but after a period of time, the network speed becomes slower. The latter situation is very obvious on desktop computers, but the network speed is normal when checking with laptop computers. For this problem, I have found that the network speed slows down e to the network cable not made according to the correct standard, which is also related to the quality of the network card. Generally, the performance of network card of desktop computer is not as good as that of notebook computer. Therefore, when troubleshooting with switching method, using notebook computer to check the network speed is normal can not rule out the problem that the network cable is not made according to the standard. We now require that all network cables should be pressed according to t586a and t586b standards, and laptops should not be used to replace desktop computers when detecting faults< Third, there are loops in the network, which lead to slow network speed
when the number of nodes involved in the network is not many and the structure is not very complex, this phenomenon rarely occurs. But in some more complex networks, there are often rendant spare lines, such as inadvertently connected will form a loop. For example, the network cable from the network center to the computer room 1, and then from the computer room 1 to the computer room 2. At the same time, there is another standby line from the network center directly connected to the computer room 2. If these lines are connected at the same time, it will form a loop, and the data packets will be sent and checked continuously, thus affecting the overall network speed. In this case, it is difficult to find. In order to avoid this situation, we are required to form a good habit when laying the network cable: the network cable should be clearly labeled, and the place where there are spare lines should be recorded. When this kind of fault is suspected, the method of partition and subsection is generally adopted< Fourth, the network speed slows down e to the broadcast storm caused by the hardware failure of network equipment
as the main means of discovering unknown equipment, broadcast plays a very important role in the network. However, with the increasing number of computers in the network, the number of broadcast packets will increase dramatically. When the number of broadcast packets reaches 30%, the transmission efficiency of the network will decrease significantly. When the network card or network equipment is damaged, it will continue to send broadcast packets, which will lead to broadcast storm and paralyze the network communication. Therefore, when the network equipment hardware failure will also cause slow network speed. When such a fault is suspected, the replacement method can be used to replace the hub or switch to eliminate the fault of the hub equipment. If there is no fault in these devices, turn off the power supply of the hub or switch, test the involved computers one by one with the "Ping" command under DOS, find the computer with the faulty network card, and replace it with a new network card to restore the normal network speed. Network card, hub and switch are the devices that are most prone to failure and slow down the network speed< In fact, router WAN port and LAN port, switch port, hub port and server network card may become network bottlenecks. When the network speed becomes slow, we can use the network management software to check the data flow of routers, switches and server ports ring the peak hours of network use; You can also use the netstat command to count the data traffic of each port. According to this, we can confirm the location of network data flow bottleneck and try to increase its bandwidth. There are many specific methods, such as changing the server network card to 100m or 1000m, installing multiple network cards, dividing multiple VLANs, changing the router configuration to increase bandwidth, etc., which can effectively alleviate the network bottleneck and maximize the data transmission speed< (6) the influence of worms slows down the network speed. This kind of virus causes the infected users to send out e-mails as soon as they surf the Internet. The virus selects the random documents in the user's personal computer and attaches them to the random address of the user's address book to send e-mails. Hundreds of such spam are sent out in line, and some are returned to the server in batches. Some backbone Internet appear obvious congestion, network speed obviously slow, make LAN nearly paralyzed. Therefore, we must upgrade the antivirus software in time; In order to improve the security and reliability of the system, the computer should also upgrade and install system patches in time, unload unnecessary services and close unnecessary ports< (7) excessive use of firewalls can also slow down the network speed. Needless to say, only one powerful firewall will be reserved after unloading< 8. System resources are insufficient. You may have loaded too many application programs to run in the background. Please load the software reasonably or delete useless programs and files to free up resources to improve the network speed
optimize your broadband to double the speed of Internet access
before optimization, you can use "Ping" to understand the relevant network parameters, or use relevant software to detect the network speed, such as "TCP optimizer"
optimize the registry (it's better to backup in advance in case): the modifiable key values are as follows: maxmt: modify the maximum transmission unit; Defaultrcvwindow and defaultttl: set the buffer size of transmission unit and TCP / IP packet lifetime; Set DNS query priority: improve the browsing speed of web pages; Improve the ram used by TCP / IP: increase the buffer used by TCP / IP to improve the data rate
release reserved bandwidth: log in as an administrator and run the command "gpedit. MSc" to enter the "group policy" window. Click "computer settings", "management mole", "network" and "QoS packet scheler" in turn, then select "limit reserved bandwidth" on the right, right-click and select "properties" to open its property window, and change the corresponding value of "limit bandwidth" to "0" to release the reserved bandwidth
optimization software: take TCP optimizer as an example, first click "maxmtu" to check the relevant parameters of the network used by users. However, when we enter the address of the website, we'd better choose the address of the local ISP instead of its default address; The same is true for "latency Ping". In the "Settings" tab, we select the type of Internet Modem we are using, then select "optimal setting" at the bottom of the above interface, and then click the "apply changes" button to restart the computer. In fact, there are many ways to speed up the computer, but there are always some dangers, which is also the reason why many people don't move their hands. Here, I'd like to introce a fast and safe method. The method described below is just the reasonable setting of the machine. There is no need for any physical transformation of the machine and the use of complex third-party optimization software. You can rest assured to see it. There are so many settings for the computer. Just after starting the computer and waiting for the memory to be detected, press the "del" key. At this time, the screen will flash and enter the heart of the computer: "BIOS" setting screen. Don't underestimate him. He controls your computer completely. Let's take off this "heart" together! On the front page of BIOS settings, we enter the "advanced BIOS features" option, move the cursor to the "frist boot DEVICD" option, and press "pageup" and "pagedown" to select. The default value is "floppy", which means that the system will read the boot information from the floppy drive at boot time, which is not applicable to our normal computer, Because it's the age of Windows 9x now, there's no need to start the disk normally, so it's futile to read the floppy drive every time you start, and it will prolong the startup time of the machine and shorten the life of the floppy drive. So we have to choose "hdd-0" to boot directly from the hard disk, so that the boot time is fast. Return to the home page and select "advanced chipset features". The settings in this option have a great impact on the acceleration of the machine. Please pay more attention. Change "bank 0 / 1 DRAM timing" from "8NS / 10ns" to "fast" or "turbo"“ "Turbo" is faster than "fast", but it is not stable. It is recommended to choose "fast". If the memory quality is good, you can choose "turbo" to try. If it is unstable, you can change it back to "fast". Looking down, you can see the "SDRAM CAS latency" option. For those with good memory quality, it is best to choose "2", but based on stability, it is recommended to choose "3". In the next is always "DRAM clock", this allows you to run the memory at a given high clock frequency, "66 changed to 100" or "100 changed to 133". Now most of the memory is PC133, so you can change it safely. It's all like this: "if it's unstable, it can be changed to the original state." Note: some versions use + 33, which means the same.) Newer motherboards all support agp4x. If your graphics card also supports agp4x, then activate it in "agp-4xmode", that is "enabled", which will give better play to the ability of the graphics card. Remember, if you support both, don't waste it Note: the activation of 4x is not a single problem, but here is just a prerequisite for opening 4x. I'll have a chance to analyze it with you in detail later.) the next item is "AGP aperture size", which is the number of system call memory as video memory. With the graal popularity of large video memory graphics cards, this option has no great significance. After testing, 16m, 32m, 64M, There is almost no difference between 128M and 16m. Even if 16m is less than 2% different from 128M, don't let too much memory wait for useless tasks. Just liberate them and choose 16m or 32m. In fact, there are many settings in the "BIOS", but the effect is not obvious. So let's put them down first, announce the end of the "heartwarming action", select "save & exit setup" and press "Y" to restart. After the "heart pinching action", the machine successfully logs on to windows. At this time, do you feel that the startup of the machine and the running of the program are much faster than before, but it still can't meet our needs. Because Windows doesn't seem to be very obedient, the setting of windows itself is not optimized. Let's conquer it by ourselves. As soon as you enter windows, you will see the machine blindly open the resident program
6. Different market softwares may have different meanings, but there are only two meanings:
the relationship between the current transaction price and the previous transaction price, or whether the current transaction is active buying or active selling
for example, the upward arrow indicates that "the current transaction price is higher than the previous transaction price" or "the current transaction is an active payment"
the downward arrow indicates that "the current transaction price is lower than the previous transaction price" or "the current transaction is an active sale order"
the horizontal bar means "the current transaction price is equal to the previous transaction price"
the relationship between the current transaction price and the previous transaction price, or whether the current transaction is active buying or active selling
for example, the upward arrow indicates that "the current transaction price is higher than the previous transaction price" or "the current transaction is an active payment"
the downward arrow indicates that "the current transaction price is lower than the previous transaction price" or "the current transaction is an active sale order"
the horizontal bar means "the current transaction price is equal to the previous transaction price"
7. 1. The red arrow represents the initiative buying (i.e. the outer bid shown above); The green arrow represents the active selling (i.e. the inner market shown above); If there is no arrow, it means two orders with the same order price (market price buy / sell is not used as reference) and the same time. This is the white arrow in the flush
2. The judgment principle of trading host, such as the current entrusted quotation:
selling price: 10.01 yuan, buying price: 10.00 yuan
active buying: if there is an entrusted buying quotation of 10.01 yuan, it will be displayed as a red arrow after the transaction, and the popular point is: the willingness of outside investors to buy this stock
active selling. For example, if there is an entrusted selling price of 10.00 yuan, it will be displayed as a blue arrow after the transaction. The popular point is: the willingness of the investors who hold the stock to sell it
ring the analysis, we can simply analyze the investors' willingness to buy and sell the stock in the current market with the help of the external and internal market. However, the stock will be invalid when the limit rises or falls. When the limit rises, all transactions are blue arrows, because the price of the trading board is the highest transaction price of the day, and only one price can be quoted when selling, so it is shown as blue arrows, that is, the internal market, But that doesn't mean investors are more willing to sell than to buy. When the limit is red arrow, with the above limit when the same.
2. The judgment principle of trading host, such as the current entrusted quotation:
selling price: 10.01 yuan, buying price: 10.00 yuan
active buying: if there is an entrusted buying quotation of 10.01 yuan, it will be displayed as a red arrow after the transaction, and the popular point is: the willingness of outside investors to buy this stock
active selling. For example, if there is an entrusted selling price of 10.00 yuan, it will be displayed as a blue arrow after the transaction. The popular point is: the willingness of the investors who hold the stock to sell it
ring the analysis, we can simply analyze the investors' willingness to buy and sell the stock in the current market with the help of the external and internal market. However, the stock will be invalid when the limit rises or falls. When the limit rises, all transactions are blue arrows, because the price of the trading board is the highest transaction price of the day, and only one price can be quoted when selling, so it is shown as blue arrows, that is, the internal market, But that doesn't mean investors are more willing to sell than to buy. When the limit is red arrow, with the above limit when the same.
8. Benefits: for users, it is convenient to carry out secondary development on the basis of the source code. Generally speaking, you know the recipe of the dish, and then modify or improve it to meet your own taste. For developers, they can constantly improve the program and improve the quality of the software. The disadvantage is that because it is open source code, it does not involve economic interests, so many people do not have enough motivation to maintain the source code.
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