Behavioral Modeling of Urban Freight Transport - Sustainable Urban Logistics: Concepts, Methods and Information Systems - page 234

Fig. 3 WTP distributions.
A comparison between M1
and M2
Similar considerations apply to M2 (see Table 6 ) where we also calculate
different WTP measures since we test and discover non-linear effects for the EF. It
is important to clarify that since we have only ameliorative variations, with respect
to the SQ level, for both LUB and PLUBF in the case of reductions of EF levels, in
order to interpret the meaning of the coefficients one has to imagine that the values
derived represent (in order to have a trade off of some sort) the amount of money