The components of a three-sector economy are households, firms, and the government.
1. Households: These are people who live in homes and consume goods and services produced by firms.
2. Firms: These are businesses that produce goods and services for households to consume. They hire workers to produce these goods and services, and they sell them in the market for a profit.
3. Government: This is the entity that governs and regulates the economy. It collects taxes from households and firms and spends money on public goods and services such as education, healthcare, and infrastructure.
This three-sector model is often used to describe modern economies, where households consume goods and services produced by firms, and the government provides necessary infrastructure and services to support these activities.