Which concept measures total spending on goods and services at a given price level and time?

• A. Inflation
• B. Aggregate Demand
• C. Equilibrium
• D. Circular Flow of Income

Answer: (B)

Aggregate demand measures total spending on the economy’s goods and services at a given price level and over a specific time. It combines household consumption, business investment, government spending, and net exports (C + I + G + NX). This means it’s the total amount people and institutions are willing and able to spend on domestically produced output at that price level. The concept is downward-sloping: as prices rise, purchasing power falls, interest rates can rise, and foreign buyers may buy fewer domestic goods, all of which reduce overall spending. That’s why it best describes the idea in the question. Inflation looks at how prices change over time, not how much is spent at one price level; equilibrium is a state where demand equals supply; the circular flow of income is a model of money moving between sectors, not a single spending measure at a price level.