What branch of economics focuses on the individual, household, and business level?

Micro-economics is the branch of economics that specifically examines the choices made by individuals, households, and businesses, and how these choices interact in markets. It analyzes how these entities decide on the allocation of limited resources, the determination of prices, and the distribution of goods and services in a specific market. By studying micro-economics, one gains insights into how individual behaviors influence supply and demand, consumer preferences, production methods, and overall market dynamics.

In contrast, macro-economics looks at the economy as a whole, examining large-scale economic factors like national income, total employment, inflation, and economic growth. International economics studies the economic interactions between countries, including trade and monetary policies, while behavioral economics focuses on the psychological factors that influence economic decision-making.