The importance of that first job for future success also means that graduates remain highly dependent on the random fluctuations of the economy, which can play a crucial role in the quality of jobs available when they get out of school. That is good news for this year's graduates, who are entering the work force with the economy growing, but rather disturbing for recent graduates who were driven by recession into taking less-than-ideal first jobs and are now aiming to work their way up.

Consider the evidence uncovered by Paul Oyer, a Stanford Business School economist, in his recent paper, "The Making of an Investment Banker: Macroeconomic Shocks, Career Choice and Lifetime Income" (National Bureau of Economic Research Working Paper 12059, February 2006. http://faculty-gsb.stanford.edu/oyer/wp/mba.pdf). Dr. Oyer tracked the careers of Stanford Business School graduates in the classes of 1960 to 1997.

He found that the performance of the stock market in the two years the students were in business school played a major role in whether they took an investment banking job upon graduating and, because such jobs pay extremely well, upon the average salary of the class. That is no surprise. The startling thing about the data was his finding that the relative income differences among classes remained, even as much as 20 years later.

The Stanford class of 1988, for example, entered the job market just after the market crash of 1987. Banks were not hiring, and so average wages for that class were lower than for the class of 1987 or for later classes that came out after the market recovered. Even a decade or more later, the class of 1988 was still earning significantly less. They missed the plum jobs right out of the gate and never recovered.

And as economists have looked at the economy of the last two decades, they have found that Dr. Oyer's findings hold for more than just high-end M.B.A. students on Wall Street. They are also true for college students. A recent study, by the economists Philip Oreopoulos, Till Von Wachter and Andrew Heisz, "The Short- and Long-Term Career Effects of Graduating in a Recession" (National Bureau of Economic Research Working Paper 12159, April 2006. http://www.columbia.edu/~vw2112/papers/nber_draft_1.pdf), finds that the setback in earnings for college students who graduate in a recession stays with them for the next 10 years.