DISCONTINUITIES IN PENSION BENEFIT FORMULAS AND THE SPOT MODEL OF THE LABOR MARKET: IMPLICATIONS FOR FINANCIAL ECONOMISTS

In their analysis of corporate pension plans, financial economists typically invoke the simplest and the most tractable model of the labor market. This is the spot model, where the worker's cash wage plus accruing pension benefit equals the value of his marginal product in each and every period. This paper provides evidence against the empirical validity of the spot model, and uses provisions common to most pension plans to do so. These findings are relevant to the appropriate measurement of pension liabilities and thus to the present controversy surrounding the termination of overfunded plans and the recapture of surplus assets by the employer. The existence of incentive effects, ruled out by the spot model, may help to unravel certain well known "puzzles," such as the failure of employers to fully fund their plans in spite of the tax advantages of doing so.