Which of the following describes the total output in the economy?

The total output in the economy is accurately described by aggregate supply. Aggregate supply represents the total quantity of goods and services that producers in an economy are willing and able to supply at a given overall price level in a specific period. It encompasses all the production occurring within an economy, reflecting the economy's capacity to produce based on available resources, technology, and labor.

In contrast, marginal cost focuses on the cost incurred when producing one additional unit of a good or service, which does not reflect the overall output level. Aggregate demand represents the total demand for goods and services within the economy; while it relates closely to output, it does not directly detail the total output itself. The total employment level measures labor input but does not account for the full spectrum of production output across different industries and sectors. Thus, aggregate supply is the most appropriate choice for describing the total output in the economy.