2. The Three-Sector Economy : In the circular flow model of three sector economy, government intervention has also been accounted for. But it is still assumed to be a closed economy, where the income flow is not influenced by any foreign sector. IN three-sector economy there are three parties: a) Household b) Firms c) Government Here, there are two important components: a. Injection: Injections are types of expenditure on goods and services that have any origin other than the household consumption. There are two types of injections: The first one is called government purchases. This includes all purchases of goods made by all levels of government employees. Government purchases do not transfer payments like social security, disability payments or unemployment compensation. The sum of government purchases and transfer payments is called the government expenditure . The second injection is investment. Investme
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