The Theory of Price is a fundamental concept in economics that explains the determining factors of how a price is set in a free economy. By analyzing the relationship between supply and demand, the fundamental concept helps economists and business owners determine an equilibrium price for any good or service.

In a free market system and through the theory of price, supply and demand work together to determine the equilibrium price for an item. As a general rule, the market price of an item is determined by the price where the amount of the item consumers are willing to purchase matches the amount of the item that the producers are willing to supply. When supply and demand are equal, the market has achieved equilibrium. This price is known as the equilibrium price.

The supply of an item is affected by a variety of factors, including the availability of raw materials and other resources needed to produce the item. Similarly, demand is also based on a number of factors, such as the ability of customers to pay for the item, the perceived value of the item, and the availability and price of rival products. When all these factors are in balance, an optimal equilibrium price is reached.

When analyzing the pricing of an item with the theory of price, economists or business owners can look at how factors such as the state of the market, the performance of competing products, and the industry trends might influence both the supply and the demand of a given item. This ultimately informs a decision when it comes to setting the optimal price for that product.

The theory of price is highly useful for business owners as it helps them determine the optimal price for their product or service. It also enables them to become more competitive in the market and determine what pricing strategies would be most beneficial for their business. An understanding of the theory of price is also important for economists, as it helps them identify potential market disruptions that may lead to price discrepancies and unusual market outcomes.