Which government entity computes U.S. GDP every three months?

The table above shows a total product schedule. Suppose that labor costs $20 per worker and fixed costs are $60. The total cost of producing 80 units equals

A) less than $5. B) more than $5 and less than $110. C) more than $110 and less than $120. D) more than $120 and less than $150. E) more than $150.

Credit card companies that operate as intermediary firms between credit card holders and business vendors are best described as

A) platforms in a shared-input market. B) end users in a shared-input market. C) platforms in a transaction-based market. D) end users in a transaction-based market.