Answer: The number of employees on non-agricultural payrolls.

**Explanation:** - **Option A (Incorrect):** The average duration of unemployment is a lagging indicator. Businesses typically wait until economic downturns are confirmed before laying off workers and until recoveries are secure before rehiring, causing this measure to lag behind the general economy. - **Option B (Incorrect):** The average weekly hours in manufacturing is a leading indicator. Businesses adjust overtime hours before making broader employment changes, making this measure predictive of economic trends. - **Option C (Correct):** Non-agricultural payrolls are a coincident indicator. Businesses adjust full-time payrolls in response to clear signs of recession or recovery, aligning this measure with current economic conditions. This question assesses understanding of economic indicators and their alignment with the business cycle, a key concept in economics.

Author: LeetQuiz Editorial Team