Subprime mortgage is very different my friend. A mortgage is basically a long-term loan that you get to buy a house. You pay it off monthly, and if for some r

Subprime mortgage is very different my friend. A mortgage is basically a long-term loan that you get to buy a house. You pay it off monthly, and if for some reason you don't make payments for a long time, well, the house goes back to the person who lent you the money to get it (usually the bank). With Bitcoins, people mine them for themselves (like finding a valuable mineral) or they buy them on an exchange. If the price of the coin goes way low, people who have a lot invested in it may not be able to sell it for a while, but hopefully nobody is getting kicked out of their house over it.