TY - JOUR AU - Rebitzer,James B. AU - Robinson,Michael D. TI - Employer Size and Dual Labor Markets JF - National Bureau of Economic Research Working Paper Series VL - No. 3587 PY - 1991 Y2 - January 1991 UR - http://www.nber.org/papers/w3587 L1 - http://www.nber.org/papers/w3587.pdf N1 - Author contact info: James B. Rebitzer Professor of Management, Economics, Public Policy Markets, Public Policy and Law Department Boston University School of Management 595 Commonwealth Ave. Boston, MA 02215 Tel: 617-383-7356 Fax: NA E-Mail: rebitzer@bu.edu Michael Robinson Dept. of Economics Mount Holyoke College South Hadley, MA 01075 E-Mail: mirobins@mhc.mtholyoke.edu AB - Recently developed effort regulation models argue that labor markets are segmented because of differences in the technology of supervision across firms. primary jobs pay above market clearing wages because these jobs are difficult to monitor. Secondary jobs, in contrast, pose no monitoring difficulties and therefore pay a market clearing wage. If, as the literature suggests, increases in employer size make supervision more difficult, we should observe that wages increase with employer size in primary jobs but not in secondary jobs. We test this hypothesis using a switching regression model. We find evidence of an employer size wage effect in both primary and secondary labor markets. However, consistent with the prediction of effort control models, the size effect on wages is considerably larger in primary than secondary jobs. ER -