It's been six months since Apple released a major new product, and as Fortune recently noted, its fans may be growing restless.

CNN: Report: Next iPhone could land this summer

When asked to explain his sudden increase in wealth at a press conference soon after our annual billionaire rankings were published, he reportedly said, "The stock market goes up ... and down, " and noted that his fortune could quickly drop.

FORBES: Carlos Slim Helu Now World's Second-Richest Man

As Laffer noted in a 1971 Fortune interview, "Thousands of people work days and nights to get those other models out, " and his study was one Nixon's top advisors incorrectly felt they could understand easily.

FORBES: Magazine Article