01 What is the main reason unpaid household work performed within a family is generally not included in NDP?
Answer and explanation
Correct answer: B. Reliable market valuation is difficult
Explanation: Unpaid household activities such as cooking, cleaning and caring for family members may create real welfare and useful services, but they normally have no market transaction or observable price. Consequently, assigning a reliable monetary value is difficult, so conventional NDP accounts generally exclude them. This exclusion reflects a measurement boundary, not an absence of usefulness.