Perhaps the price of bitcoin and inflated over the last 2017 year, but the model of bitcoin, called the block and block chain is unique in this generation. Ponzi scheme tries to find an analogy with the bitcoin price. That payments to old depositors, at the expense of new revenues. But if you go deep into the stock market and its fundamental feature, we will notice there is a similar similarity. If in one place will arrive at YYY amount, on the same amount and lose anything.