In: Economics
3)
a) A giffen good is a good for which demand increase as price of the good increases. Giffen good violates the law of demand. Three characterstics that a good must possess to be considered as a giffen good are:
4)
Allocative efficiency refers to the level of output where Price of the commodity is equals to the marginal cost of production. This point is allocative efficient because here the total surplus maximizes and there is no deadweight loss. A point is Allocative efficient, if the movement from that point cause decrease in surplus of any party involved.
If we talk about different market situations then only perfectly competitive optimal condition is an allocative efficient result.