Total cost equals total variable cost plus marginal cost

The distribution of income

a. is about the same in most countries b. tends to be more equal in developing countries than in developed countries c. is more concentrated in the United States than in Canada or Japan d. is more even in developing countries than in the Russia e. is not related to a country's level of development

Which of the following pairs is the best example of substitutes?

a. Coffee and cream. b. Honey and biscuits. c. Tortillas and salsa. d. Hiking boots and athletic shoes.