Think of the current economy as a game of Monopoly where the Banker is also a player who can print extra money for themselves and change the rules of the board whenever they are losing.
Eventually, the other players realize they can never win and stop trying, becoming dependent on the Banker's "charity."
Bitcoin is like introducing a new, digital board where the rules are written in stone, no one can print extra money, and the Banker is replaced by a transparent computer program that treats every player exactly the same. 
