a. The arc cross-price elasticity of demand for commodity T with respect to changes in the price of commodity Z between:
I. Points A to B is:
Ecp=10−8180−200×180+20010+8=−0.474.
II. Points C to D
Ecp=15−13100−150×100+15015+13=−2.8.
b. So, the goods are complements.
c. The arc own price elasticity of demand for commodity Z between points C and D is:
Ecp=15−13120−150×120+15015+13=−1.56.
So, the demand is elastic.
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