Summarize the main points in this article about demand and supply.
Input: https://www.investopedia.com/terms/d/demandandsupply.asp
Demand and supply are the forces that determine the price of a good or service in a market economy. Demand refers to the amount of a particular product that customers are willing to buy at a given price, while supply refers to the amount of a product that producers are willing to provide at a certain price. When demand for a product exceeds supply, prices increase to ration the available supply. Conversely, when supply exceeds demand, prices will drop to clear the excess inventory.
Demand and supply are the two sides of the same economic coin. Demand refers to the amount of a goods or services that people are willing to buy at a certain price, while supply is the amount of goods or services producers are willing to make or provide at a certain price. These two factors balance out to determine the equilibrium price and quantity of a good or service in a market. When the demand for a good or service exceeds the supply, the price and quantity increase. When the demand is greater than the supply, this is known as a price increase. When the supply is greater than the demand, the price decreases.