​How does an increase in income affect the market for iPads (normal good) ?

A) ​The demand curve for iPads shifts to the right
B) The demand curve for iPads shifts to the left
C) The supply curve for iPads shifts to the right
D) ​The supply curve for iPads shifts to the left

The advantage of offering a price promotion during periods of low demand to shift some of the demand into a slow period is

A) a demand pattern that is less expensive to supply.
B) very high inventory costs because inventory needs to be carried from period to period.
C) in the fact that a firm could get by with a smaller,more expensive factory.
D) much of the expensive capacity would go unused during most months when demand was lower.