Neoclassical synthesis

The neoclassical synthesis (NCS) was an important idea in economics. It tried to mix two big ways of thinking about how the economy works.

It wanted to combine the ideas 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 hard times, while neoclassical economists thought markets would fix themselves.

This idea began in the middle of the 20th century. Famous economists like John Hicks, Franco Modigliani, and Paul Samuelson helped create it. They shaped economic thinking after World War II, especially in the 1950s, 60s, and 70s.

The neoclassical synthesis said that markets work best on their own in the long run. But in the short run, governments could help by spending money and using monetary policy to improve jobs and growth.

In the 1970s, problems like stagflation made some people question these ideas. This led to new ways of thinking in economics.

Emergence of the neoclassical synthesis

The neoclassical synthesis was a way to combine two big ideas in economics. One idea came from John Maynard Keynes. He studied why economies could have trouble, especially when there wasn’t enough spending. The other idea came from earlier economists like Adam Smith and Alfred Marshall. They looked at how markets work over the long term.

After the Great Depression, many economists tried to mix these ideas. They believed 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. It was widely used after World War II. During this time, many new discoveries were made in understanding big-picture economics.

Empirical developments

The IS-LM model, created by Hicks in 1937, helps us understand big economic ideas. It simplifies these ideas into a model with three markets. The LM curve shows the link between money and output. The IS curve shows the link between goods and interest rates. 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 thought 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 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 ideas that started what we now call Keynesian economics. The first group of economists who followed him tried to mix these ideas with classical economics and the work of Alfred Marshall.

Paul Samuelson began the neoclassical synthesis. He talked about two main areas: static theories, where balance happens because of smart choices, and dynamic theories, where prices change after upsets to find 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 not long after Keynes published his book General Theory, beginning with the IS-LM model by John Hicks in 1937. It also included updates to the supply and demand model to fit Keynesian ideas. These updates showed how costs and rewards 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 thought this new theory should combine the best parts of older economic research. It would agree that using money and government policies can help keep the economy steady and create full employment. After him, the market economy alone might not create full employment. But with the right policies, the economy can follow classical balance ideas to set prices and use resources well. This work later led to developments like monetarism in the 1960s.

Main provisions

Firms and individuals make sensible choices, and we can study their actions with economic tools. Feelings and attitudes also affect demand through investment.

Prices and wages don’t change quickly, 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 helps manage the economy, especially 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 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 mixed ideas from John Maynard Keynes and neoclassical economics. This helped answer big economic questions.

It began in 1937 when J. Hicks wrote a paper called Mr. Keynes and Classics. He made a simple model called the IS-LM scheme to explain Keynes' ideas. Later, in the 1940s and 1950s, economists like F. Modigliani and Paul Samuelson helped grow these ideas. Samuelson made up the term "neoclassical synthesis" in 1955. He taught and supported this new theory. By the 1950s, many new ideas were added, like better models and ways to see how wages and money affect the economy.

Legacy

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

These problems showed that the old ideas about how the economy works did not fully explain what was happening. Because of this, economists started new ways of thinking about the economy. Today, these newer ideas are 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 for a little while. But it also says these changes won’t matter in the long term because prices and wages will change 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, for a short time, some workers and industries might have a hard time 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.'