The name is absent

Using (19) in (18) and simplifying, access value can be written as

Mx /#3

M x "

The Marshallian consumer's surplus approximation to access value is the integral
of the Marshallian demand over the interval (sp₃⁸,p₃^8!),

which, when integrated and simplified, can be expressed as

M⁸
M x "

TheDS Model with Two Constraints on Choice

The foregoing discussion developed the new DS system in terms of a money expenditure
function only, which is appropriate for standard money-constrained choice problems that
are used in most areas of demand analysis. When choice is constrained by time in
addition to money, as is likely with most recreational activities, a two-constraint version
of the model is needed. The properties of two-constraint choice models have been
discussed elsewhere (Bockstael, Hanemann, and Strand; Larson and Shaikh 2001). In
particular, Larson and Shaikh (2001) have identified the parameter restrictions on
demand systems that follow from the assumption that time is costly. It is straightforward
to show that the Marshallian demand system in (5) satisfies these conditions.

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