The market capitalization of the crypto currency, which reflects the aggregate value of all bitcoins in circulation, was $ 105 billion.
Earlier, at least 2018 was recorded on February 6, when the value of the digital currency dropped to $ 6048. The last time the bitcoin rate fell below $ 6000 last year - October 29, when its value reached $ 5724.
This is not what cost means. Cost is the money incurred on production, as in the case of bitcoin, the amount of money that is spent to mine one bitcoin. What you're referring to here is the price of bitcoin, and not the cost. Cost aka mining expenses are increasing due to increase in mining difficulty, while the price of bitcoin is being affected by demand and supply. And market cap isn't a big deal, there's no real use to it.