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the dollar is worth the same in orlando. the bread itself is worth more in NYC.

if you can buy less of the same thing with the same dollar, is it really worth the same in different areas? (no)

But if both people buy an item from the same vendor (say, an online store that services both areas), then obviously they would pay the same amount.

The differences in price you are describing are not changes in the value of the dollar but changes in the cost of producing and providing goods.

Google "unit of account"