Cite as: 535 U. S. 467 (2002)
Opinion of the Court
panies by interexchange carriers, In re Policy and Rules Concerning Rates for Dominant Carriers, 5 FCC Rcd. 6786, 6787, ¶ 1 (1990).
The price-cap scheme starts with a rate generated by the conventional cost-of-service formula, which it takes as a benchmark to be decreased at an average of some 2-3 percent a year to reflect productivity growth, Kahn, Telecommunications Act 330-332, subject to an upward adjustment if necessary to reflect inflation or certain unavoidable "exogenous costs" on which the company is authorized to recover a return. 5 FCC Rcd., at 6787, ¶ 5. Although the price caps do not eliminate gamesmanship, since there are still battles to be fought over the productivity offset and allowable exogenous costs, United States Telephone Assn., supra, at 524, they do give companies an incentive "to improve productivity to the maximum extent possible," by entitling those that outperform the productivity offset to keep resulting profits, 5 FCC Rcd., at 6787-6788, ¶¶ 7-9. Ultimately, the goal, as under the basic prudent-investment rule, is to encourage investment in more productive equipment.
Before the passage of the 1996 Act, the price cap was, at the federal level, the final stage in a century of developing ratesetting methodology. What had changed throughout the era beginning with Smyth v. Ames was prevailing opinion on how to calculate the most useful rate base, with the disagreement between fair-value and cost advocates turning on whether invested capital was the key to the right balance between investors and ratepayers, and with the price-cap scheme simply being a rate-based offset to the utilities' advantage of superior knowledge of the facts employed in cost-of-service ratemaking. What is remarkable about this evolution of just and reasonable ratesetting, however, is what did not change. The enduring feature of ratesetting from Smyth v. Ames to the institution of price caps was the idea that calculating a rate base and then allowing a fair rate of
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