If you open any standard textbook or listen to policy debates today, you are hearing the echoes of one man. That man is John Maynard Keynes, and he is widely celebrated as the father of macroeconomics. Before he came along, the field as we know it did not really exist. Economists mostly looked at individual markets and assumed everything would work itself out. Keynes smashed that idea and gave us a new set of tools to understand how the economy functions as a whole.
The World Before Macroeconomics
To understand why Keynes is so important, you have to look at the world before him. In the early 20th century, the dominant theory was classical economics. The experts believed that free markets were perfect self-correcting machines.
They thought that if unemployment was high, wages would naturally fall. Once labor became cheaper, businesses would hire more people, and full employment would return. It was a nice, neat theory. Then the Great Depression hit.
In the 1930s, the machinery broke. Wages fell, but businesses did not hire. They fired even more people. The classical economists were baffled. Their models said this was impossible, but millions of people were starving.
The General Theory
Keynes looked at the disaster and realized the old rules were wrong. In 1936, he published a book with a very long title. It was called The General Theory of Employment, Interest and Money. This book is basically the birth certificate of macroeconomics.
He argued that the economy is driven by demand, not supply. He said that just because a factory can produce cars does not mean anyone has the money to buy them. If people are scared or broke, they stop spending. When spending stops, businesses lose income and fire workers. These workers then spend less, creating a vicious downward spiral.
He called this lack of spending a shortage of “aggregate demand.” He proved that an economy could get stuck in a depression and stay there indefinitely. The market would not save itself.
The Government as a Spender of Last Resort
This is where his most radical idea came in. Keynes argued that when the private sector retreats, the government must step up.
If consumers and businesses are saving their cash, the government needs to spend. It should build roads, schools, or dams. It almost does not matter what the money is spent on, as long as it gets into the pockets of workers. Those workers will then go out and buy food and clothes, which gives businesses a reason to hire again.
He suggested that during a recession, the government should run a deficit. This was heresy at the time. Politicians thought governments should budget like a household. Keynes showed that the government is different. It has the power to jump-start the engine.
Animal Spirits
Another great contribution from the father of macroeconomics was his understanding of psychology. He knew that markets are not always rational. He coined the term “animal spirits” to describe the human emotions that drive financial decisions.
Sometimes investors are optimistic and take risks. Other times, they panic and hide their money under the mattress. You cannot calculate this with a simple equation. You have to understand human nature.
His Legacy Today
Today, every central bank and finance ministry in the world uses Keynesian ideas. When the 2008 financial crisis happened, governments around the world rushed to stimulate their economies. They did the same thing during the recent pandemic.
Even modern theories like MMT build on the foundation he laid. He taught us that money is a tool we created, and we should use it to serve society. He showed us that mass unemployment is not an act of nature, but a failure of policy.
John Maynard Keynes died in 1946, but his influence is still very much alive. Whenever a crisis hits and we look to the state for a solution, we are walking in his footsteps.
