I've seen this sentences in manny topics:
"Bitcoin will never go below 6000 because its mining cost is in that range"or questions like:
"What will happend when bitcoin will drop below mining cost. Will it destroy network?"and my favourite
"If bitcoin price will go below mining cost then noone will mine bitcoins and bitcoins amount will stop to increase what will pump price"Ill try to explain this as good as i can and i hope to start bigger conversation to extend my knowledge.
"If bitcoin price will go below mining cost then noone will mine bitcoins and bitcoins amount will stop to increase what will pump price"Bitcoin mining is based on lending computing power for bitcoin network to process transactions. When noone will mine bitcoins noone will be able to transfer bitcoins. Miner reward is based on:
1-bitcoin distribution - its constant amount set in bitcoin code. No matter if there is 1 miner on 1 PC or thousends of mining halls full of GPU (or rather antminers for biitcoin).
2-trasnaction fees - it depends on the number of transactions
Thats why no matter how many bitcoin miner there are there will alwais be the same amount of new bitcoin each month.
"Bitcoin will never go below 6000 because its mining cost is in that range"There is nothing that will stop bitcoin at this price when supply will be pushing price lower. There is no magic God's hand on market that will stop price and say "stop... no more... noone can sell now... bitcoin miners have to have profit". Life knows dozens of situations when production cost become bigger than market price. Thats why we have "unprofitable" word in dictionary. What will happend? Weak miners (with not the best hardware, not the best energy price, not the best management) will find bitcoin mining unprofitable first. They will stop mining what will lower dificulty for others and bitcoin mining will become profitable at lower prices (mining will be easier and also amount of bitcoin from distribution pool will be divided into a smaller number of miners". To be ohnest that might be good for our enviroment knowing fact that bitcoin network consume the same amount of energy as Hungary.
"What will happend when bitcoin will drop below mining cost. Will it destroy network?"Bitcoin network will mine 1 block every 10 min no matter what. No matter if there is 1 PC running or dozens of mining halls full of GPU. Every 2016 blocks (exact 2 weeks with 10 min per block) bitcoin network is checking how much time was spent to mine 1 block. If it was lower than 10 min bitcoin network will increase difficulty. If it was bigger than 10 min it will decrise difficulty.
"The target is a 256-bit number (extremely large) that all Bitcoin clients share. The SHA-256 hash of a block's header must be lower than or equal to the current target for the block to be accepted by the network. The lower the target, the more difficult it is to generate a block.
It's important to realize that block generation is not a long, set problem (like doing a million hashes), but more like a lottery. Each hash basically gives you a random number between 0 and the maximum value of a 256-bit number (which is huge). If your hash is below the target, then you win. If not, you increment the nonce (completely changing the hash) and try again." https://en.bitcoin.it/wiki/Target