sentence1: recently , correa et al studied a new type of pricing mechanism so called contingent preannounced pricing in which the retailer commits to a price menu which states what would be the future price as a function of the number of available inventory .
sentence2: correa et al studied a new type of pricing mechanism so called contingent preannounced pricing in which the retailer commits to a price menu which states what would be the future price as a function of the number of available inventory .