Economic gravity models are analogies of the physical gravitation law developed by Isaac Newton in his book “Philosophiae Naturalis Principia Mathematica” (1687).
Interaction between locations is determined by “weights” and distance.
Economic weights can be determined in several ways, for example number of inhabitants or GDP.
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9.1 The concept of gravity Isaac Newton (1643-1727)
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9.3 Graphs in Regional Economics - Accessibility Index (AI): Sum of Row in Accessibility matrix - The higher AI the more accessible a point is - According to AI Region 4 (Brussel-Antwerp) is the most accessible
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