If your income rises by one percent and, as a result, you buy more steak, then steak is a(n)

Which of the following is true?

i. A rational choice is always made in the pursuit of social interest. ii. Economics is a social science. iii. Economists try to understand how the economic world works by testing positive statements. A) only i B) ii and iii C) only ii D) i and ii E) only iii

The height of the market supply curve

a. at any quantity shows the value -- to someone -- of the last unit of the good consumed b. at any quantity shows the cost -- to someone -- of purchasing the last unit of the good c. at any quantity shows the marginal cost of producing the last unit of a good d. shows the market value of a good or service e. measures the size of the side payment necessary to achieve a Pareto improvement