Solution:
Autarky in international trade means the idea of self sufficiency and no international trade by a country. A country is said to be in a complete state of autarky if it has a closed economy, which means that it does not engage in international trade with any other country.

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Solution:
Price of product is not a cause of shift in cost curves of a firm. Cost curves shift in response to changes in two factors: If a technological change results in the firm using more capital, the average fixed cost curve shifts upward and at low levels of output, the average total cost curve may shift upward. At large output levels, average total cost decreases.

Solution:
According to Keynes, interest is a payment for Liquidity preference. The Liquidity Preference Theory says that the demand for money is not to borrow money but the desire to remain liquid. In other words, the interest rate is the 'price' for money.

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