The cost of a hospital stay has been going down slowly

You took a job as a salesperson in an insurance company with the knowledge that you have 0.5 chance of making $2,000 a month or $3,000 a month. How much will you make each month?

A) definitely $2,500 B) definitely $2,000 C) definitely $3,000 D) either $2,000 or $3,000

Suppose biochemists discover an enzyme that can double the amount of ethanol that may be derived from a given amount of biomass. Based on this technological development, we expect the:

A) supply curve for ethanol to shift leftward. B) supply curve for ethanol to shift rightward. C) demand curve for ethanol to shift leftward. D) demand curve for ethanol to shift rightward.