Explanation:

- Price Level (Option 1):

- It refers to the average of current prices across the entire spectrum of goods and services produced in the economy.

- Changes in the price level are a major concern in macroeconomics as they relate to inflation and deflation.

- Unemployment (Option 2):

- Represents the number of people actively seeking work but unable to find employment.

- It is a key indicator of macroeconomic health and affects economic policy decisions.

- Demand (Option 3):

- This is related to the consumer's willingness and ability to purchase goods or services.

- While impacting macroeconomics, it is more directly associated with microeconomic analysis.

- Supply (Option 4):

- Refers to the total amount of a specific good or service available to consumers.

- Like demand, it plays a significant role but is primarily a microeconomic concept.

Unemployment (Option 2) is indeed an example of a macroeconomic problem.