Thanks to this post of yours I now understand how bitcoin works. However, I have a few questions. Firstly, if only 21 million bitcoins were made, I suppose its value would depend on demand and supply. So, bitcoin owners will be able to sell their bitcoins for more than they have paid for it? If this is the case, 21 million may at the end of the day belong to only a few. Or am I wrong? Secondly, how and where does one buy bitcoins? Thirdly, what if the seller of goods doesn't accept bitcoins as payment? How many businesses accept bitcoins instead of money?