This paper argues that trade unions have a number of distinct and possibly conflicting effects on wages. This contrasts with the vast bulk of the literature which focuses on estimating a simgl measure of the union differential or "mark-up". We use data at the work-place level for the United...

The analysis of the economic effects of trade unions on labour markets has evolved in a quite unsteady way, with empirical findings posing theoretical unsolved puzzles and theoretical analyses being either almost absent or amazingly prolific (Pencavel, 1991). This paper presents a brief survey...