Sasha buys a warm soda and a slice of cold pizza. the marginal utility from a soda is 40, and the price of the soda is $1. the marginal utility from a slice of pizza is 80. since sasha always chooses the utlity-maximizing choice, we the price of a slice of pizza must
a. $0.50.
b.$1.
c. $2.
d. $20.

Plastic and steel are substitutes in the production of body panels for certain automobiles. if the price of plastic increases, with other things remaining the same, we would expect: a) the demand curve for plastic to shift to the left. b) the price of steel to fall. c) the demand curve for steel to shift to the left d) nothing to happen to steel because it is only a substitute for plastic. e) the demand curve for steel to shift to the right