Why Do Prices Suddenly Change on Everything at Once?

Imagine you and your friends are all playing with coins in a jar. When one person adds more coins to the jar, it becomes harder for everyone else to get what they want, that's like sudden price changes. In real life, when a lot of money gets added into the economy quickly (like from a big government spending), prices jump up at once because there's not enough stuff to go around.

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Examples

  1. You get a big birthday check, so you go buy everything at once, prices go up because all your friends are doing it too.
  2. The government gives everyone extra money for a holiday, suddenly, everything is more expensive.
  3. After a war, the army comes home with lots of extra cash, and everything becomes more expensive.

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