The Bitcoin currency was designed to be deflationary.  Most other fiat currencies are inflationary.  What that means is with Bitcoins, the longer you save, the more valuable it would become, so long as the currency succeeds and people trust it.  With most other currencies that aren't backed by anything but trust, they can print as much money out of thin air as they want, so long as trust is maintained.  However, saving money with these inflationary currencies means you'll lose money the longer you save.  Right now many worldwide fiats are becoming more fragile and trust is gradually being lost as countries try to print more money to bail out the rich people, allowing them to maintain their wealth with the newly printed money while everyone else gets devalued money in return.  The disparity between rich and not rich has widened at a greatly accelerated rate since the economic collapse.