Using a classification of benefits and costs of promotional offers along three routes – economic, informational and affective – this paper aims at evaluating, from the consumer's point of view, the relative perceptual disadvantages of separate-item bundles compared to pre-wrapped bundles.
PARGUEL, B., DE PECHPEYROU, P., SABRI-ZAARAOUI., O. and DESMET, P. (2007). Format Effects in Volume Discounts to Consumers. Journal of Product and Brand Management, 16(5), pp. 348-357.