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Explain the relationship between national saving and investment in a closed economy. 2. Explain the relationship between national saving and investment in an economy that can transact with other countries. 3. How do transactions with other countries affect the relationship between expenditure by domestic residents and the disposable income of domestic residents? 4. Is there any relationship between a country’s current account and government budget deficits? you don’t have to answer long. Please be simple as possible. Thank you!