principles of economics પુસ્તક કોણે લખ્યું? plz plz plz anser me
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alferd Marshall .
are lakhyou che
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principle 1
people fact tradeoffs
principle2
cost of something is what you give up to get it
principle3
rational people think at a margin
principle4
people respond to incentives
principle5
trade can make everyone better off.
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