Good X and Y are substitute good. Explain the effect of fall in price of Y on demand for X.

demand of X will fall becoz a rational consumer will shift it's consumption from good x to good y as it costs him/her less than good y and gives him same utility..

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substitute goods are those which can substitute each other...
as X And Y are substitute goods if the price of goods of Y commodity false then the demand of the goods of commodity X false...

and u can explain it through diagram...

price of X commodity remains constant and Y commodity price false which is substitute good than demand for X commodity also falls
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costs him less than good X**
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