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What are the main operating systems? Provide a brief overview.
GNP
Gross National Product; the total value of goods produced and services provided by a country during one year, plus the net income from foreign investments.
GDP
Gross Domestic Product, which is the total value of all goods and services produced within a country's borders in a specific time period.
Households
Economic units consisting of all persons who occupy a dwelling, which make decisions on consumption, savings, and investments.
Firms
Business organizations that use resources to produce goods or services for sale with the aim of making a profit.
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