Why did economist event the term Stagflation to describe the economic problems in the US during the 1970?

Economists coined the term "stagflation" in the 1970s to describe the unusual economic situation characterized by stagnant economic growth, high unemployment, and high inflation occurring simultaneously. This phenomenon challenged conventional economic theories, which suggested that inflation and unemployment typically had an inverse relationship. The term encapsulated the difficulties faced during this period, particularly due to oil price shocks, supply chain disruptions, and shifts in monetary policy. Stagflation highlighted the complexities of managing an economy experiencing both inflationary pressures and a lack of growth.