Gravity model of trade

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The gravity model of trade in international economics is a model that, in its traditional form, predicts bilateral trade flows based on the economic sizes and distance between two units. Research shows that there is "overwhelming evidence that trade tends to fall with distance."

Excerpt from the Wikipedia article “Gravity model of trade”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Danny Quah, CC BY-SA 4.0, via Wikimedia Commons.