valley. (building construction). An inside angle formed where two sloping sides intersect. (geography). A generally broad area of flat, low-lying land bordered by higher ground.
In ordinary usage, price is the quantity of payment or compensation given by one party to another in return for goods or services.
Understand the economic concept of utility. Utility is the value or satisfaction that a consumer gets from consuming a certain number of goods. A good way of thinking of it is that utility is how much money a consumer would hypothetically pay for the satisfaction provided by a good.