| { wage worker employment labor } | 0.22 |
| { variable coefficient model regression } | 0.20 |
| { political committee interest vote } | 0.15 |
| { ha problem make doe } | 0.09 |
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George J. Stigler, Private Vice and Public Virtue, Journal of Law and Economics, 1961.
Aaron Director, The Parity of the Economic Market Place, Journal of Law and Economics, 1964.