0.51 Ross D. Eckert George W. Hilton, The Jitneys, Journal of Law and Economics, 1972.
| { service postal rates railroad } | 0.51 |
| { made make case part } | 0.13 |
| { cartel industry company note } | 0.05 |
| { law economic economics system } | 0.04 |
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Michael E. Levine, Regulating Airmail Transportation, Journal of Law and Economics, 1975.