Indicate the effect that each of the following conditions will have on a firm's average variable cost curve and its average cost curve.

(a)The movement of a brokerage firm's administrative offices from New York City to New Jersey, where the average rental cost is lower.

(b)An agreement reached with the labor union in which wage increases are tied to productivity increases.

(c)The elimination of sugar quotas (as it pertains to those firms that use a lot of sugar, such as bakeries and soft drink bottlers).

(d)Imposition of stricter environmental protection laws.