Standard vertical differentiation models were designed for a type of consumer behaviour when each consumer buys a single unit of only one of two goods. However, in many other cases, consumers may buy a few units of both goods with different qualities. This case is not covered by theory yet. This paper intends to fill this gap, by modelling consumer behaviour and demand with vertical differentiation when all consumers may buy some mix of both qualities. Additionally, we find that two main results of the previous vertical differentiation literature do not apply in this case and show how the model can be extended to a number of situations. We also present an example of how the model may be applied to Tourism and Transport industries.
consumer choice; vertical product differentiation; demand; tourism