| { gas oil price natural } | 0.31 |
| { ha problem make doe } | 0.25 |
| { cost benefit le increase } | 0.15 |
| { wa made year id } | 0.07 |
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Gary Becker, Toward a More General Theory of Regulation, Journal of Law and Economics, 1976.
Gardiner C. Means, Hessen's "Reappraisal", Journal of Law and Economics, 1983.