Consumption of fixed capital (depreciation) can be determined by:
O adding net investment to gross investment.
O adding taxes on production and imports to NDP.
O subtracting NDP from GDP.
O subtracting net investment from GDP.

Verified Answer :

To determine the consumption of fixed capital, also known as depreciation, let's understand the relevant economic concepts and perform the mathematical operations appropriately:

1. Gross Domestic Product (GDP): This is the total value of all goods and services produced within a country over a specific time period.

2. Net Domestic Product (NDP): This is the GDP minus depreciation. It represents the value of goods and services produced minus the value lost as a result of depreciation of capital.

The relationship between GDP and NDP can be written as:
\(\[ \text{NDP} = \text{GDP} - \text{Depreciation} \]\)

3. Consumption of Fixed Capital (Depreciation): This term refers to the wear and tear or reduction in value of capital goods like buildings, machinery, and equipment.

Rearranging the above equation to solve for depreciation, we get:
\(\[ \text{Depreciation} = \text{GDP} - \text{NDP} \]\)

Given the options:

1. Adding net investment to gross investment:
\(\[ \text{This does not directly relate to depreciation}. \]\)

2. Adding taxes on production and imports to NDP:
\(\[ \text{This operation does not relate to calculating depreciation}. \]\)

3. Subtracting NDP from GDP:
\(\[ \text{This matches our derived formula for depreciation}. \]\)

4. Subtracting net investment from GDP:
\(\[ \text{This does not provide us with the value of depreciation}. \]\)

Based on the breakdown and the correct understanding of economic concepts, the correct answer is:

\(\[ \text{Subtracting NDP from GDP} \]\)

So, the correct choice is:

O subtracting NDP from GDP.