When we evaluate outcomes both before and after a change in some variable it is known as comparative statics.
In economics, comparative statistics is the comparison of two different economic outcomes before and after changes in underlying exogenous parameters.
Compares two different equilibrium states after a tuning process (if any) as a kind of static analysis.
Comparative statistics are commonly used to describe changes in demand and supply when analyzing a single market, and changes in monetary or fiscal policy when analyzing the economy as a whole. Comparative statistics is an analytical tool in microeconomics (including general equilibrium analysis) and macroeconomics.
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