| It depends on who's getting the service or the good. Say you're about to have a date with the girl of your dreams, and you're at home preparing for it, and you realize that your hair looks like a fing jungle. You need a haircut fast. You don't care about gold. At that point of time you're willing to pay more for a haircut than for a useless bar of gold.
Or, to use a different example, let's say you start buying gold. Your first bar of gold might be very valuable to you - you've never seen gold before! You aren't as excited when you buy the second one, although you do want more gold. But after buying a lot of gold and you fill your whole house with gold, the value of the next bar of gold that you're about to buy will be less and less. At some point of time the supplier will have to PAY YOU, in order for you to purchase more gold. At that point of time, a haircut would be much more valuable to you. |