What is the Difference between Income consumption curve and price consumtion curve?

Answer 1

I'll give an introductory idea: In Microeconomics a consumer's well-being or how better off he is, is measured by his utility function. Utility function is a function of those variables that influence his well being i.e. consumption of goods/services that increase his well-being. His utility can be maximised subject to his money income with which he can buy the goods that maximise his utility. After finding the optimal consumption bundle using calculus, we find them to be functions of the exogenous variables such as Prices and Income. This must hold true because as Prices of goods rise, we consume less of that commodity and substitute it by the other good. Similarly as Income rises for normal goods consumption of both rises by the same proportion.

After knowing the above, we come to the Income and price consumption curves. Income consumption Curves (ICC) are locus of those points that connect the optimal consumption of goods as income changes (ceteris paribus) in a Good x Good framework, when you choose to draw it in a Good x Income framework you get the Engel Curve. Similar is the Price consumption curve, which is the locus of points connecting commodity consumption against price changes of a particular good (ceteris paribus) in a Good x Good framework.