Neoclassical synthesis

The neoclassical synthesis (NCS) was an important idea in economics that tried to bring together two big ways of thinking about how the economy works. It wanted to mix the thoughts of John Maynard Keynes from his book The General Theory of Employment, Interest and Money with neoclassical economics. Keynes talked about how governments can help during tough economic times, while neoclassical economists believed that markets would fix themselves over time.

This idea started in the middle of the 20th century. Famous economists like John Hicks, Franco Modigliani, and Paul Samuelson helped create it. They were important in shaping what people thought about economics after World War II, especially in the 1950s, 60s, and 70s.

The neoclassical synthesis said that in the long run, markets work best on their own. But in the short run, governments could help by spending money and using monetary policy to make jobs and growth better. This mix helped many people understand economics better for a while. But in the 1970s, problems like stagflation made some question these ideas, leading to new ways of thinking in economics.

Emergence of the neoclassical synthesis

The neoclassical synthesis was a way to bring together two big ideas in economics. One idea came from John Maynard Keynes, who studied why economies could struggle in the short term, especially when there wasn't enough spending. The other idea came from earlier economists like Adam Smith and Alfred Marshall, who focused on how markets work in the long term when everything balances out.

After the Great Depression, many economists tried to mix these ideas. They thought both could be true, but in different time periods. In the short term, Keynesian ideas helped explain why economies might slow down. In the long term, the older ideas about markets balancing out were still important. This mix became known as the neoclassical synthesis and was widely used after World War II. During this time, there were many new discoveries in how to understand big-picture economics.

Empirical developments

The IS-LM model, created by Hicks in 1937, helps us understand big economic ideas by simplifying them into a model with three markets. The LM curve shows how money and output relate, while the IS curve shows how goods and interest rates connect. Together, they help us see how output and interest rates are decided.

We also learned about the link between unemployment and wages from Phillips in 1958. When there is less unemployment, wages tend to go up, which can lead to higher prices. Economists also started thinking about how people expect prices to change when they agree on wages. They introduced the idea of a "natural rate of unemployment," seeing recessions and high unemployment as temporary. This all helped economists study important things like output, jobs, interest rates, and prices.

To use these models for real predictions, economists needed to test their ideas. In the early 1950s, Klein from the University of Pennsylvania and Modigliani from MIT began this work. Later, Tobin in 1969 helped us understand investment by popularizing the "Q Theory". This theory looks at the value of companies and when they might issue shares for new projects.

Tobin and Baumol also studied how people decide to hold money. They found that families choose between keeping money in cash or in assets that earn interest, balancing the benefits and costs of each choice.

Macroeconomic principles underlying microeconomics

Big ideas about how people spend money, save money, and choose what to buy were studied in special journals.

Two important ideas were developed: one by Friedman and another by Modigliani. Friedman said people plan their spending based on what they think they will earn over their whole life, not just this year. He believed people try to keep their spending steady, even when their income changes.

Modigliani focused on how people’s income changes during their lives. He said young people often borrow money because they expect to earn more later. In older age, when income is lower, people might use their savings to keep spending steadily. For this to work, there needs to be good banking and financial services that everyone can use.

Main contributors

John Maynard Keynes created the ideas that formed the base of what we now call Keynesian economics. The first group of economists who followed him worked to mix these ideas with classical economics and the writings of Alfred Marshall.

Paul Samuelson began the neoclassical synthesis. He described two main areas of study: static theories, where equilibrium happens because of rational actions, and dynamic theories, where prices change after shocks to reach balance. Many important economists like John Hicks, Maurice Allais, Franco Modigliani, Alvin Hansen, Lawrence Klein, James Tobin, and Don Patinkin helped build neo-Keynesian theory. This work started soon after Keynes published his book General Theory, beginning with the IS-LM model by John Hicks in 1937. It also included changes to the supply and demand model to fit Keynesian ideas. These changes showed how costs and incentives shape decision making, like how prices and income affect what people buy, as explained in consumer theory.

Paul Samuelson first used the term "neoclassical synthesis" in his famous book Economics. He believed this new theory should bring together the best parts of older economic research. It would agree that using fiscal and monetary policies can help keep the economy stable and create full employment. Following him, the market economy alone might not create full employment. But with the right policies, the economy can follow classical balance principles to set prices and use resources well. This work later led to developments like monetarism in the 1960s.

Main provisions

Firms and individuals are seen as making sensible choices, and their actions can be studied using standard economic tools. However, feelings and attitudes also play a big role in shaping overall demand through investment.

Prices and wages don’t change fast enough to balance markets, so markets aren’t always perfectly competitive. There isn’t an automatic balance in the job market, but this balance can be reached with the right use of money-related and government spending policies. The state has an active role in managing the economy, especially in areas where markets don’t work well or there are social costs and benefits. Economic management focuses on finding the right mix of these policies. Math is widely used to study how different policies affect the economy.

Main article: Animal spirits

Main articles: Monetary, Fiscal policy

Further information: Tâtonnement, Paul Samuelson, Market failures

Development

The neoclassical synthesis tried to mix ideas from two big economic thoughts: the ideas of John Maynard Keynes and neoclassical economics. This mix helped create new ways to understand big economic questions.

It started in 1937 when J. Hicks wrote a paper called Mr. Keynes and Classics. He made a simple model called the IS-LM scheme to show Keynes' ideas in easier terms. Later, in the 1940s and 1950s, other economists like F. Modigliani and Paul Samuelson helped grow these ideas. Samuelson even made up the term "neoclassical synthesis" in 1955. He worked hard to teach and support this new theory. By the 1950s, many important ideas were added, like better models and new ways to look at how wages and money affect the economy.

Legacy

In the 1950s and 1960s, many people believed that good economic policies could keep the economy strong forever. But in the 1970s, big problems like rising prices and high unemployment appeared together, which surprised many economists.

These problems showed that the old ideas about how the economy works did not fully explain what was happening. As a result, economists started new ways of thinking about the economy. Today, these newer ideas form the basis of how most economists understand the world.

Sometimes, economists from the older ideas are called “Old-Keynesians.”

Application of the neoclassical synthesis

In areas like money management and government spending, the neoclassical synthesis shows how changing the amount of money or how much the government spends can affect jobs and production in the short term. However, it also says these changes won't affect real outcomes like jobs and output in the long term because prices and wages will adjust to balance things out.

The neoclassical synthesis suggests that free trade helps most countries over time. It says countries should focus on making things they can produce well and trade for other goods with other countries. This leads to better use of resources and more production overall. However, in the short term, some workers and industries might struggle with competition from other countries. The theory suggests governments can help with support for workers and training programs.

For labor markets, the neoclassical synthesis looks at how jobs and wages are decided. It says wages are set where the amount of work needed meets the amount of work people want to do. When more goods are needed or productivity improves, more workers are hired and wages may rise. The theory also says that over time, wages and jobs will balance out, but things like minimum wage laws or labor unions might cause delays. Governments can help by encouraging competition and flexibility.

Main articles: Krugman's, Helpman, E.'