Paper money is only limited by earth's supply of trees 
At least digital currency is "backed" by the mining's ever-soaring level of difficulty. This built-in scarcity model prevents deflation of bitcoin value, raises the miners' bar for return on investment, and thereby guarantees a steady climb in price. Each transaction buyer wants to hold for a later price rise, and so on down the line. Not every trader can outwait their own need for their own fiat currency, so naturally there are trades at a loss. Whoever has the most patience and greatest wealth can end up with a large hoard of bitcoins.
At least digital currency is "backed" by the mining's ever-soaring level of difficulty. This built-in scarcity model prevents deflation of bitcoin value, raises the miners' bar for return on investment, and thereby guarantees a steady climb in price. Each transaction buyer wants to hold for a later price rise, and so on down the line. Not every trader can outwait their own need for their own fiat currency, so naturally there are trades at a loss. Whoever has the most patience and greatest wealth can end up with a large hoard of bitcoins.