The price we pay for goods and services is not arbitrary but results from the interplay between buying and selling decisions in markets. These markets can take various forms, from a local market to an online store or the stock exchange.
In any market, buyers and sellers have opposing goals: the former seek the lowest possible price, while the latter aim for the highest. The price adjusts until the quantity demanded equals the quantity supplied, a point known as the equilibrium price. At this point, resources are efficiently allocated to produce the goods and services most valued by society.
The price acts as a signaling mechanism, similar to a traffic light, coordinating millions of decisions. When the price is below equilibrium, demand exceeds supply, encouraging sellers to raise it. Conversely, if the price is above equilibrium, supply exceeds demand, leading sellers to lower it to clear stocks. These adjustments continue until the market reaches equilibrium, where the quantity demanded and supplied are equal. External changes, such as shifts in income or production costs, can move this equilibrium point.
