A study that favored disposable diapers was conducted by Franklin Associates, whose research showed disposables were not any more harmful than cloth diapers. But the sponsor of the study was The American Paper Institute, an organization with major interests in disposable diapers. This is an example of .

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