Okun refers to the economic concept known as Okun's Law, which describes the relationship between unemployment and economic output. Specifically, it suggests that for every 1% increase in the unemployment rate, a country's gross domestic product (GDP) will be roughly an additional 2% lower than its potential GDP. This relationship helps economists understand how changes in employment levels can impact overall economic performance. The concept was introduced by economist Arthur Okun in the 1960s. Okun's Law is often used by policymakers to gauge the effectiveness of economic policies aimed at reducing unemployment and stimulating growth. It highlights the importance of job creation in maintaining a healthy economy.