rack inversion
n.— «Meanwhile, independent station owners are getting squeezed. The gas they buy on the spot market, which is usually lower priced than that provided to branded stations under contract, is now higher, Langley said. This “rack inversion,” as it’s called in the trade, means that independents may be paying more at wholesale than the branded stations charge at retail.» —“Expert: Local gas prices headed toward $4 a gallon” by Bradley J. Fikes North County Times (Escondido, California) Nov. 3, 2007. (source: Double-Tongued Dictionary)