An office worker who loses her job because she does not have the necessary computer skills is, ceteris paribus:

Which of the following economists is/are considered the leader(s) in the theory of market behavior?

(a) Alfred Marshall (b) Adam Smith (c) David Ricardo (d) All of the above

The total cost of production equals

a. average total cost + average variable cost b. average total cost + average fixed cost c. average variable cost + average fixed cost d. total fixed cost + total variable cost e. marginal cost + total variable cost