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.
The total cost of choosing one action over another. The economic cost includes the accounting cost, or actual funds spent carrying out the action, and the opportunity cost, or the amount of money that could have been made by using funds and other resources dedicated to the action on some other objective.