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Microeconomics focuses on how individual consumers and firms make decisions; these individual decision making units can be a single person, a household, a business/organization, or a government agency. Analyzing certain aspects of human behavior, microeconomics tries to explain how they respond to changes in price and why they demand what they do at particular price levels. Microeconomics tries to explain how and why different goods are valued differently, how individuals make financial decisions, and how individuals best trade, coordinate, and cooperate with one another. Microeconomics' topics range from the dynamics of supply and demand to the efficiency and costs associated with producing goods and services; they also include how labor is divided and allocated; how business firms are organized and function; and how people approach uncertainty, risk, and strategic game theory. Suppose marginal propensity to consumers is 0.75 and there ia a 20 percent proportional icome tax. Find the change in equillibrirum income when Government purchase increase by 20.Macroeconomics studies an overall economy on both a national and international level, using highly aggregated economic data and variables to model the economy. Its focus can include a distinct geographical region, a country, a continent, or even the whole world. Its primary areas of study are recurrent economic cycles and broad economic growth and development