What is the relation between good X and Y in each case , if with the fall in price of X demand for good Y 1)rises 2)falls give reason.

Dear student,

1) If with fall in price of X demand for good Y rises than X and Y are complementary  goods.
Complementary goods are those which are consumed together.
For example: pen and ink; car and petrol, etc.

2) If with fall in price of X demand for good Y also falls then both X and Y are  substitute goods.
Substitute goods are those which can be consumed in place of one another. 
For example: tea and coffee.

Regards

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