Microeconomics

Some people study how we make choices.

They look at how people and shops act.

People have limited things to use. We must decide how to use them. This is called microeconomics.

Shops must decide what to make. They look at costs like tools and work. They want to make a profit.

Buyers choose what makes them happy. They use the money they have. They pick the best things for them.

This helps us see how prices work. It is a very smart way to learn!

Microeconomics is a way to study how people make choices. It looks at how individuals and firms act. It also looks at how they use limited resources.

People and shops must make decisions. People want to buy things that make them happy. They must do this with the money they have. This is called a budget constraint. Firms want to make a profit. They must decide which goods to make. They look at costs like labor and materials.

One big idea is supply and demand. Supply is how much of a product is available. Demand is how much people want to buy it. These two things help set the price.

Sometimes markets fail to work well. This can lead to waste. In these cases, a government might help. They might use rules to fix the problem.

There are also different kinds of costs. A fixed cost stays the same, like rent. A variable cost changes, like the cost of raw materials. There is also opportunity cost. This is the value of the next best thing you give up when you make a choice.

Microeconomics is a special branch of economics. It studies how individuals and companies make choices. These people and firms must decide how to use scarce resources. Resources are things that are limited in amount. Microeconomics looks at small parts of the economy. It focuses on single markets, specific sectors, or even whole industries. This is different from macroeconomics. Macroeconomics looks at the total economic activity of a whole country. It studies big issues like growth, inflation, and unemployment.

There are many ways to understand how these choices work. One way is to look at how people spend money. Economists study how a person tries to get the most happiness. They call this maximizing utility. A person must do this while following a budget constraint. A budget constraint is a limit on how much money someone can spend.

Another way is to study production. This is the process of turning inputs into outputs. Companies use resources like labor and materials to make goods. They also think about costs. A fixed cost stays the same, like paying rent for a building. A variable cost changes, like the cost of raw materials used for making items.

History shows us how these ideas grew over time. In 1874, Léon Walras wrote about general equilibrium theory. Later, in 1890, Alfred Marshall introduced partial equilibrium theory. The difference between micro and macro economics was likely made in 1933. A Norwegian economist named Ragnar Frisch introduced these ideas. He won a Nobel Memorial Prize in Economic Sciences in 1969. He did not use the exact word "microeconomics" at first. He used the term "micro-dynamic" instead. The first person to use the word "microeconomics" in a paper was Pieter de Wolff in 1941.

Many important rules help explain how markets behave. One rule is supply and demand. Supply is how much of a product is available. Demand is how much people want to buy that product. These two forces work together to set prices. Sometimes, markets do not work perfectly. This is called market failure. In these cases, resources might not be used well. This can lead to waste. A government might step in to help. They might use rules or direct control to fix the problem.

Making choices always involves a special kind of cost. This is called opportunity cost. It is the value of the next best thing you give up. For example, if you choose waffles instead of chocolate, the chocolate is your opportunity cost. You can only do one thing at a time. This means every choice has a hidden cost. Microeconomics helps us see these connections everywhere. It helps us understand why we buy what we buy. It also explains why companies make certain products.

Microeconomics is a specialized branch of economics. It focuses on the behavior of individual agents. These agents include single people and private firms. They make decisions about how to use scarce resources. Scarce resources are assets that are limited in amount. Microeconomics studies how these agents interact in specific markets. It examines individual sectors or entire industries. This differs from macroeconomics, which studies total economic activity. Macroeconomics looks at national issues like inflation and unemployment.

One central goal is analyzing market mechanisms. These mechanisms help establish relative prices for goods and services. They also determine how limited resources are allocated among different uses. Economists look for conditions where free markets create efficient results. However, they also study market failure. Market failure occurs when markets fail to produce efficient results. This can lead to suboptimal resource allocation. In these cases, resources are not used in the best way possible.

Microeconomic theory often starts with the individual. Economists assume individuals are rational and seek to maximize utility. Utility is a measure of satisfaction or happiness. Rationality means a person has stable, complete, and transitive preferences. To model this, economists use the utility maximization problem (UMP). The UMP is a constrained optimization problem. It explains how an individual seeks maximum utility subject to a budget constraint. A budget constraint is a limit on spending. This mathematical model explains both how and why people make choices.

There are different ways to approach these theories. One method is general equilibrium theory. Léon Walras developed this in his 1874 work, *Elements of Pure Economics*. Another method is partial equilibrium theory. Alfred Marshall introduced this in his 1890 book, *Principles of Economics*. Some economists use revealed preference theory instead. This model takes actual consumer choice as the starting point. Rather than assuming tastes, it looks at what people actually do. This provides a different way to build economic theory.

Production theory is another vital part of microeconomics. It studies the process of converting inputs into outputs. Inputs can include labor, materials, and capital. This process creates goods for use, gifts, or market exchange. Firms must consider the cost of production to ensure profit. The cost-of-production theory states that price is determined by resource costs. These costs include labor, land, capital, and taxation. Technology can act as fixed capital or circulating capital.

Understanding different types of costs is essential for firms. Fixed costs do not change with the amount of output. Examples include rent, salaries, and utility bills. Variable costs change based on how much is produced. These include raw materials and delivery costs. Short-run total cost is the sum of fixed and variable costs. Over long periods, many costs become variable. For example, a firm can eventually sell machinery or change its workforce. Sunk costs are fixed costs that cannot be recovered. Research and development in the pharmaceutical industry is a common example.

Every choice involves an opportunity cost. This is the value of the next-best alternative. Because time and resources are limited, you can only do one thing at a time. Choosing one option means giving up another. If you choose waffles over chocolate, the chocolate is your opportunity cost. This cost depends only on the value of that next alternative. Even if you have thousands of choices, the opportunity cost is just the single best one you missed.

Microeconomics also connects to broader social and political systems. When markets fail, governments may intervene. They might use direct control or regulation to improve welfare. This area is studied through collective action and public choice theory. Some models use the Paretian norm to measure optimal welfare. This is a mathematical application of the Kaldor–Hicks method. It focuses on efficiency rather than how goods are distributed. These microeconomic foundations are now used to build modern macroeconomic theories.