In petroleum, downstream industry: any agreement, combination or concerted action by refiners, importers and/or dealers, or their representatives, to fix prices, restrict outputs or divide markets, either by products or by areas, or allocate markets, either by products or by areas, in restraint of trade or free competition, including any contractual stipulation which prescribes pricing levels and profit margins [Section 3(i), Downstream Oil Industry Deregulation Act of 1998 IRR]
