Consumer purchase decision

Question

If the price of a good is given, how does a consumer choose/decide as to how much of that good to purchase?

Answer 1

The Consumer purchases upto point where the marginal utility is equavalent to the price (MU=P). So long as marginal utility is bigger than price, he keeps on purchasing. As he makes purchases MU falls or downs and at a specific quantity of the good MU becomes equavalent to price. Consumer bought upto this point.