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CETERIS PARIBUS

8 May, 2015 - 10:17

It is a common assumption which states that nothing else changes.

The law of demand establishes the relationship between the quantity an individual is willing to buy, and price. It is usually necessary to keep income unchanged, and assume that tastes do not change. Otherwise, quantity could change because of changes in income or tastes, and nothing could be said about changes in quantity due to price changes.