Supply and demand determine prices in a market economy from "summary" of The Economics Book by DK
Supply and demand are the forces that interact to determine prices in a market economy. When the supply of a good or service exceeds the demand for it, prices tend to fall. Conversely, when demand exceeds supply, prices tend to rise. This relationship between supply and demand is at the heart of how prices are determined in a market economy.
The supply of a good or service is influenced by factors such as the cost of production, technology, and the number of suppliers in the market. For example, if the cost of producing a particular good decreases, suppliers may be willing to offer more of that good at a lower price. On the other hand, if the cost of production increases, suppliers may reduce the amount of that good they are willing to supply, leading to higher prices.
Demand, on the other hand, is influenced by factors such as consumer preferences, income levels, and the prices of related goods. When consumers have a strong preference for a particular good, they are willing to pay a higher price for it. If incomes rise, consumers may be willing to spend more on goods and services, increasing demand. Conversely, if the price of a substitute for a good decreases, demand for that good may fall.
In a market economy, prices act as signals that help to allocate resources efficiently. When prices are too high, it signals that there is excess demand for a good and suppliers may increase production to meet that demand. When prices are too low, it signals that there is excess supply and suppliers may reduce production. This process of price adjustment helps to bring supply and demand into balance.The interaction of supply and demand in a market economy helps to ensure that resources are used efficiently and that goods and services are produced and consumed at the right levels. By responding to changes in prices, both suppliers and consumers play a role in determining the prices of goods and services in a market economy.

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