What Is a Price?
a price is the amount of money that a buyer gives to a seller in exchange for a good or a service
traded price
spot price
economists refer to the price as
market-clearing price
What is the supply and demand?
Demand
The demand is the amount of a good or service that people want to buy.
supply
the offer as that amount of goods or services that the producers are willing to sell under market conditions
the price at which the amount of a good or service supplied by all sellers in a market is equal to the amount demanded by all buyers.
The supply and demand of a good or of a service change depending on the price
other prices are
marginal price
are conceptual
etc.
Others are related to the timing of a potential transaction or to the relative power of the buyer and the seller
In the market to buy or sell is relative because everything can depend on many factors such as: how much is willing to pay the buyer or how much this willing to sell the seller, the need may have the purchaser of this product or the need of selling the product from the seller etc.
the above factors come from the following topics
Clearing the market
Many prices
Paying for certainty