Questions: A schedule or curve that shows the total quantity of output (real GDP) demanded at alternative price levels in a given time period, ceteris paribus is called aggregate supply aggregate GDP demand aggregate demand

The answer is the last one: aggregate demand.

Explanation for each option:

1. Aggregate supply: This refers to the total quantity of goods and services that producers in an economy are willing and able to supply at different price levels, not the quantity demanded.

2. Aggregate GDP: This term refers to the total market value of all final goods and services produced within a country in a given period. It is a measure of economic output, not a schedule or curve showing demand.

3. Demand: While this term refers to the desire for goods and services backed by the ability to pay, it does not specifically refer to the total quantity of output demanded at various price levels in an economy.

4. Aggregate demand: This is the correct answer. It is a schedule or curve that shows the total quantity of output (real GDP) demanded at alternative price levels in a given time period, ceteris paribus (all other things being equal).

In summary, the correct term for the concept described in the question is "aggregate demand."