230
Opinion of the Court
30, 38 (CADC 1990), this Court has repeatedly stressed that rate filing was Congress's chosen means of preventing unreasonableness and discrimination in charges: "[T]here is not only a relation, but an indissoluble unity between the provision for the establishment and maintenance of rates until corrected in accordance with the statute and the prohibitions against preferences and discrimination." Texas & Pacific R. Co. v. Abilene Cotton Oil Co., 204 U. S. 426, 440 (1907); see also Robinson v. Baltimore & Ohio R. Co., 222 U. S. 506, 508-509 (1912). "The duty to file rates with the Commission, [the analog to § 203(a)], and the obligation to charge only those rates, [the analog to § 203(c)], have always been considered essential to preventing price discrimination and stabilizing rates." Maislin Industries, U. S., Inc. v. Primary Steel, Inc., 497 U. S. 116, 126 (1990); see also Arizona Grocery Co. v. Atchison, T. & S. F. R. Co., 284 U. S. 370, 384 (1932) (filing requirements "render rates definite and certain, and . . . prevent discrimination and other abuses"); Armour Packing Co. v. United States, 209 U. S. 56, 81 (1908) (elimination of filing requirement "opens the door to the possibility of the very abuses of unequal rates which it was the design of the statute to prohibit and punish"). As the Maislin Court concluded, compliance with these provisions "is 'utterly central' to the administration of the Act." 497 U. S., at 132, quoting Regular Common Carrier Conference v. United States, 793 F. 2d 376, 379 (CADC 1986).
Much of the rest of the Communications Act subchapter applicable to Common Carriers, see 47 U. S. C. §§ 201-228, and the Act's Procedural and Administrative Provisions, 47 U. S. C. §§ 401-416, are premised upon the tariff-filing requirement of § 203. For example, § 415 defines "over-charges" (which customers are entitled to recover) by reference to the filed rate. See § 415(g). The provisions allowing customers and competitors to challenge rates as unreasonable or as discriminatory, see 47 U. S. C. §§ 204, 206-
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