Okun gap – definition and meaning

The Okun gap or output gap is the difference between an economy’s potential and actual GDP. We refer to the Okun gap as an inflationary gap when actual output is larger than the potential output. Conversely, we refer to it as a recessionary gap when the actual output is inferior to the potential output.

The money supply, unemployment, and some other factors contribute to the difference between an economy’s potential and actual GDP. GDP stands for Gross Domestic Product.

Okun gap – a macroeconomic term

The term ‘Okun gap’ is a macroeconomic term. Macroeconomics focuses on general or large-scale economic factors, such as GDP, interest rates, prices, and unemployment.

We can express an Okun gap in either absolute or percentage terms. In other words, the total amount in dollars or a percentage of GDP.

It is a measure of how much output the economy produced in a given time relative to its full-employment level.

American economist Arthur Okun (1928-1980) discovered Okun’s law. He was a professor at Yale University and a senior economist at the CEA (1968/69) during President Lyndon Johnson’s term in office. CEA stands for Council of Economic Advisers.

Okun’s law is an empirical relationship in economics. It states that a certain change in GDP results in a different but correlated change in the unemployment rate. The Okun gap is one of the relationships Prof. Okun described in Okun’s law.

Okun Gap - image explaining meaning plus example
When unemployment is high, GDP could have been higher if unemployment were lower. The difference between what GDP actually was and what it could have been is the Okun gap. (Image: adapted from images.slideplayer.com)

Prof. Okun once said that the notion that all unemployment is the result of high wages is a myth. It is like believing that a hole in a flat tire is on the bottom because the bottom is flat.

Okun gap equation

Okun reasoned that when the unemployment rate is high so are idle resources. Therefore, one could expect the actual rate of output to be below its potential. However, an extremely low rate of unemployment would correlate with a reverse scenario.

Thus, the Okun gap took the following form:

Unemployment Rate = C + D (Gap between potential and actual output)

Variable ‘C‘ is the unemployment rate in relation to full employment.

According to The Legal Dictionary, the Okun gap is:

“The gap between the potential and actual GDP of a country. If the actual output is higher, we refer to the gap as an inflationary gap. If it is lower, it is known as a recessionary gap.”

“Factors such as unemployment and money supply often contribute to the Okun gap.”