We consider the effects of demographic and expenditure variables on consumer demand in a system of Engel curves using a smooth coefficient semiparametric model where the expenditure effects on the budget shares vary nonparametrically with demographic variables such as the age of head and number...

An additive partially linear regression model is used to estimate non-parametrically the effects of total expenditure and age in the context of Engel curves and to investigate the specification and welfare interpretation of the age effects in parametric models of consumer behaviour. Empirical...

. Intermediaries often arise in order to facilitate trade in markets characterized by asymmetric information. In this paper we study the intermediary role of tour operators in the market for package tourism. Policymakers have tried to address information asymmetries in this market by providing...