2. Introduction 18/04/20132  One important problem in business is to determine the effect on revenue of a change in the price of a good.  If the firm lowers the price then it will receive less for each item, but the number of items sold increases.  The crucial factor here is not the absolute changes in P and Q but rather the proportional or percentage changes.

3. Types of Elasticity 18/04/20133  If the percentage rise in Q is greater than the percentage fall in P then the firm experiences an increase in revenue. Under these circumstances we say that demand is elastic.  Demand is said to be inelastic if demand is relatively insensitive to price changes. In this case, the percentage change in quantity is less than the percentage change in price.  If the percentage changes in price and quantity are equal, leaving revenue unchanged. We use the term unit elastic to describe this situation.

4. Price elasticity of demand 18/04/20134

5. Rumus Elastisitas 18/04/20135

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7. Example 18/04/20137

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18. Price elasticity of supply 18/04/201318

19. Example 18/04/201319

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22. Latihan Soal 18/04/201322 1. Find the price elasticity of demand at P = 6 for each of the following demand functions

23. Latihan Soal (2) 18/04/201323 2. Consider the supply equation

24. Stop!! 18/04/201324  Minggu depan bisa dibaca: “Optimization of economic functions”