| { dealer manufacturer retailer sale } | 0.58 |
| { wa made year id } | 0.14 |
| { cost benefit le increase } | 0.10 |
| { ha problem make doe } | 0.07 |
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R. H. Coase, Payola in Radio and Television Broadcasting, Journal of Law and Economics, 1979.
Harvey J. Levin, The Radio Spectrum Resource, Journal of Law and Economics, 1968.