  It can be observed that the purchasing decision of an individual consumer in
an electronic marketplace is determined by a set of factors, such as personal
characteristics of the consumer, product pricing, minimum price-quantity
combination offered, decision-making space, and underlying motivation of the
consumer. These factors are combined to form a consumer's choice problem
domain, which plays a pivotal role in the product offering. In this study, we
attempt to focus on how the products? Offered can be customized by
incorporating the quantity and pack size of the products along with the factors
above to form a more extensive domain for examining the combined effects of all
of these factors on demand. Accordingly, the demand function is defined by a
novel method invoking the extended domain of choice problem in the electronic
marketplace. Consequently, the predictable uncertainty associated with the
consumer's demand function may disappear, increase the likelihood of earning
optimum revenue through customized combinations of the components of the
extended domain of choice problem, and improve the understanding of the
fluctuations in consumer demand. Finally, we propose a generalized price
response function with standard properties applicable to E-Commerce.
