In a small, closed economy, national income (GDP) is $ 400.00 million for the current quarter. Individuals have spent $ 150.00 million on the consumption of goods and services. They have paid a total of $ 200.00 million in taxes, and the government has spent $ 150.00 million on goods and services this quarter. Use this information and the national income identity to answer the questions. How much is spent on investment in this economy?

The amount spent in this economy in the said quarter is $100,000,000.00

Explanation:

However, in closed economies what it simply means is that there are no exports and imports.

Investment (I) = business investment plus residential investment plus inventory investment. Government Purchases (G) = general government consumption plus general government investment. Net Exports (NE) = exports minus imports plus net tourism.

∴ to calculate the amount of money spent on this closed economy, I will use the Expenditure Approach formula for GDP and make Investment the subject of the formula which is

GDP formula is used which states that total output/GDP (Y) is equal to Consumption (C) + Investment (I) + Government Spending (G) + Net exports (NX). Where net exports is exports (X) minus imports (M): NX = X – M.

Where:

GDP (Y) = C + I + G + (X-M)

Where:

GDP (Y) = $400,000,000.00

C = $150,000,000.00

I = 0

G = $150,000,000.00

(X-M) = 0

GDP (Y) = C + I + G + (X-M) =

$400,000,000.00 = $150,000,000.00 + (I) + 150,000,000.00 + (X-M)

Making (I) the subject of the Formula

GDP- C -G = I

∴ $400,000,000.00 - $150,000,000.00 - $150,000,000.00 = I

∴ $400,000,000.00 - $300,000,000.00

= $100,000,000.00

The amount spent in this economy in the said quarter

= $100,000,000.00.

Note: I did not add the Tax because I used the Expenditure approach method which does not include the tax values while the Income Approach method does include it but excludes Export and Import values.