If a company uses a keystone price of $40, how much was the cost of the item to the company? it’s $20

Costs of production that do not change when output changes.question 17 options: total revenuefixed incometotal costfixed cost

When used-car dealers signal the quality of a used car with a warranty, a. buyers believe the signal because the cost of a false signal is high b. it is not rational to believe the signal because some used-car dealers are crooked c. the demand for lemons is eliminated d. the price of a lemon rises above the price of a good used car because warranty costs on lemons are greater than warranty costs on good used cars

Which of these is an example of innovation?