When a firm produces one unit, the variable cost is $3. When the firm produces two units, the variable cost is $6. What is the marginal cost associated with two units of production?

If the required reserve ratio is one-third, currency in circulation is $300 billion, and checkable deposits are $900 billion, then the currency-deposit ratio is

A) 0.25. B) 0.33. C) 0.67. D) 0.375.

When Feeding America changed its food allocation system to one that resembled a market, each food program was given a number of "shares" that they could use in bidding against other food programs for the types of food that best met the needs of the

people using their programs. This is an example of how the market leads firms to provide consumers with the goods they want, which Adam Smith described by using the metaphor A) the invisible hand. B) ceteris paribus. C) don't look a gift horse in the mouth. D) don't bite the hand that feeds you.