Wednesday, February 3, 2016
Michael Simkovic (Seton Hall), Smaller or Larger Law Class Sizes Don’t Predict Changes in Financial Benefits of Law School:
One of the most surprising and controversial findings from Timing Law School was that changes in law school graduating class size do not predict changes in the boost to earnings from a law degree.* Many law professors, administrators, and critics believe that shrinking the supply of law graduates must surely improve their outcomes, because if supply goes down, then price—that is, earnings of law graduates—should go up.
In a new version of Timing Law School, Frank McIntyre and I explore our counterintuitive results more thoroughly. (The new analysis and discussion appear primarily in Part III.C. “Interpreting zero correlation for cohort size and earnings premium” on page 18-22 of the Feb. 1, 2016 draft and in Table 10 on the final page).
Our results of no relationship between class size and earnings premiums were robust to many alternative definitions of cohort size that incorporated changes in the number of law graduates over several years. This raises questions about whether our findings are merely predictive, or should be given a causal interpretation.
We considered several interpretations that could reconcile our results with a supply and demand model and with the data. The most plausible interpretation seemed to be that when law class sizes change, law graduates switch between practicing law and other employment opportunities that are equally financially rewarding. While changes in the number of law graduates might have an impact on the market for entry-level lawyers, such changes are much less likely to have a discernible impact on the much larger market for highly educated labor.