Step 1: Understanding the individual unit.
In economics, the household is the basic unit that makes consumption decisions, as they decide how to allocate their income to purchase goods and services.
Step 2: Explanation of other options.
- (A) Household: Correct. Households are the individual decision-makers that determine consumption based on their income.
- (B) Firm: Incorrect. Firms make production decisions, not consumption decisions.
- (C) Government: Incorrect. The government makes decisions about fiscal and monetary policies, not individual consumption.
- (D) External sector: Incorrect. The external sector refers to international trade and investment, not individual consumption decisions.
Step 3: Conclusion.
Thus, the individual unit that takes decisions related to its own consumption is the household.
Final Answer: Household.