49 U.S.C. § 13701: Requirements for reasonable rates, classifications, through routes, rules, and practices for certain transportation

a movement of household goods, a rate for a movement by or with a water carrier in noncontiguous domestic trade, or rates, rules, and classifications made collectively by motor carriers under agreements approved pursuant to section 13703, Through routes and divisions of joint rates for such transportation or service must be reasonable. When the Board finds it necessary to stop or prevent a violation of subsection (a), the Board shall prescribe the rate, classification, rule, practice, through route, or division of joint rates to be applied for such transportation or service. A complaint that a rate, classification, rule, or practice in noncontiguous domestic trade violates subsection (a) may be filed with the Board. For purposes of this section, a rate or division of a motor carrier for service in noncontiguous domestic trade or water carrier for port-to-port service in that trade is reasonable if the aggregate of increases and decreases in any such rate or division is not more than 7.5 percent above, or more than 10 percent below, the rate or division in effect 1 year before the effective date of the proposed rate or division. The percentage specified in paragraph (1) shall be increased or decreased, as the case may be, by the percentage change in the Producers Price Index, as published by the Department of Labor, that has occurred during the most recent 1-year period before the date the rate or division in question first took effect. The Board shall determine whether any rate or division of a carrier or service in noncontiguous domestic trade which is not within the range described in paragraph (1) is reasonable if a complaint is filed under subsection (c) or section 13702(b)(6). Upon a finding of violation of subsection (a), the Board shall award reparations to the complaining shipper or shippers in an amount equal to all sums assessed and collected that exceed the determined reasonable rate, division, rate structure, or tariff. Upon complaint from any governmental agency or authority and upon a finding or violation of subsection (a), the Board shall make such orders as are just and shall require the carrier to return, to the extent practicable, to shippers all amounts plus interest, which the Board finds to have been assessed and collected in violation of subsection (a).