Suppose the individual name is let's say John, and has an income of . Therefore if
John's income is and the price of beans is per kg and the price of peas is per kg. If he consumes kg of beans and he is spending all of his income then he is going spend his income equal to on peas.
so; is the total Kg's of peas John is going to consume.
Now assuming the price of peas falls from to , using the same argument as above he would be consuming Kg's of peas.
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