Why do economists use nominal GDP to compare different countries at a single point in time, but use real GDP to compare one country to itself at different points in time?

Macroeconomics
13th Edition
ISBN:9781337617390
Author:Roger A. Arnold
Publisher:Roger A. Arnold
Chapter7: Macroeconomic Measurements, Part Ii: Gdp And Real Gdp
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Why do economists use nominal GDP to compare different countries at a single point in time, but use real GDP to compare one country to itself at different points in time?

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