Economists sometimes use a closed economy model because:

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Using a closed economy model simplifies the analysis and allows for more precise examination of specific economic factors without the added complication of international trade. While there may be few countries that do not engage in any trade with others, the closed economy model is still useful for analyzing individual economies. Additionally, exports and imports do have an effect on the economy, but examining their impact falls under the scope of an open economy model.

Economists Sometimes Use a Closed Economy Model Because