2.3. Payment vehicle
The manner in which the payment of theWTP amount is made, including
the timing and duration of the payment, is known as the payment
vehicle. This study applied an out-of-pocket voluntary payment
vehicle. We asked respondents their annual contribution for the rest
of their lives. For example: “A 50% decrease in air pollution emissions
by 2030 will increase life expectancy by 6 months. What is the maximum
amount of money you would be willing to pay (annually, for the
rest of your life) to gain 6 months of life expectancy? The maximum
amount ofmoney I amwilling to pay is..... € or £ | per year”. The conversion
from Pounds to Euros was based on 2010 exchange rate. Respondents
were reminded to take their annual household net income into
account prior to answering the WTP question what they as a person
would be willing to pay.