In the Base Estimate, the willingness-to-pay estimate was derived from two contingent valuation studies (Viscusi et al.
Two separate studies contributed to the estimate of willingness-to-pay.
The willingness-to-pay estimate was arrived at by interviewing people on the street.
It took me a long time to understand.
The woman is riding a bike
There is a man sleeping holding a camera.
The pitbull catches the tennis ball.
a child was there
Why do you say such a thing?