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Abstract
A number of studies have used estimation procedures to model wage equations to account for
union self-selection endogeneity. However, no recent study has examined the supermarket
industry using these various procedures using an extended year data set. This Plan B Paper uses
standard ordinary least squares, full-information maximum likelihood, and an instrumental
variables approach to estimate the coefficients in the standard wage determination equation. It
uses data from the Current Population Survey from 1984 - 1993, a period of declining real
wages and of declining union influence.