For many developing countries, natural resources or agricultural commodities make up ________ share of exports

The law of increasing opportunity costs implies that a society's production possibilities curve will be a straight line

a. True b. False Indicate whether the statement is true or false

Which of the following, necessarily, equals zero when the firm's short-run output level is zero?

a. sunk costs b. fixed costs c. implicit costs d. variable costs e. opportunity costs