| Inflation means rise in general price level. Inflation directly affects purchasing power of a currency (say Dollar). For example, if you are purchasing one orange in 1 $ today, and general price level will rise tomorrow , the orange will become expensive (say 2$ each) which means 1 Dollar cannot buy an orange now, it can only buy half of it if possible. This means purchasing power of Dollar declined.
So i this way Dollar tomorrow worth less than Dollar today OR Dollar today worth more than Dollar tomorrow due to Inflation.
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