“Suppose we ask people how much they would be willing to pay for public goods under the assumption that they will be charged their proportionate share of the cost of providing them. Perhaps surprisingly, there is no incentive for them to lie, and instead an incentive for them to do their best to tell the truth. If they like the public good, they should say so because this will have the effect of increasing the amount provided. And they need not fear that by revealing that they like the good a great deal they will be charged any more than others who like it less, since all will be charged the same amount. If they don’t like the public good, they should say so because this will have the effect of moving the supply decision in the direction they prefer, even if it doesn’t mean they will pay less than everyone else.”
I don’t understand what this means. So people say how much they would like to have of the public good, but everyone pays the same amount?