| { service postal rates railroad } | 0.43 |
| { table number data percent } | 0.14 |
| { costs cost time net } | 0.14 |
| { made make case part } | 0.09 |
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Michael E. Levine, Regulating Airmail Transportation, Journal of Law and Economics, 1975.
Ross D. EckertGeorge W. Hilton, The Jitneys, Journal of Law and Economics, 1972.