When calculated correctly the income approach and the expenditure approach should be?

When calculated correctly, the income approach and the expenditure approach to measuring a country's gross domestic product (GDP) should yield the same result. The income approach sums all incomes earned in the production of goods and services, while the expenditure approach totals all expenditures made on final goods and services. This equivalence is based on the principle that all income generated from production ultimately translates into spending in the economy. Discrepancies may arise in practice due to measurement errors or unreported economic activities.