Which of the following is correct concerning stock market irrationality?
a. Bubbles could arise, in part, because the price that people pay for stock depends on what they think someone else will pay for it in the future.
b. Economists almost all agree that the evidence for stock market irrationality is convincing and the departures from rational pricing are important.
c. Some evidence for the existence of market irrationality is that informed and presumably rational managers of mutual funds generally beat the market.
d. All of the above are correct.