10 U.S.C. § 2392 : US Code - Section 2392: Prohibition on use of funds to relieve economic dislocations

      (a) In order to help avoid the uneconomic use of Department of
    Defense funds in the procurement of goods and services, the
    Congress finds that it is necessary to prohibit the use of such
    funds for certain purposes.
      (b) No funds appropriated to or for the use of the Department of
    Defense may be used to pay, in connection with any contract awarded
    by the Department of Defense, a price differential for the purpose
    of relieving economic dislocations.