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## What is the Definition of a Gravity Model?

Gravity models are mathematical models used to simulate the interaction between two objects. The model is based on the principle of gravity, which states that the force between two objects is proportional to the product of their masses and inversely proportional to the square of the distance between them.

Gravity models are used in a variety of fields, including economics, geography, sociology, and transportation planning. In economics, for example, gravity models are used to estimate the trade flows between two countries. In geography, they are used to predict the interaction between two cities. In sociology, they are used to measure the strength of social ties between two individuals. And in transportation planning, they are used to predict the flow of people and goods between two locations.

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Gravity models typically include a number of parameters that can be adjusted to better fit the data. These parameters include the distance between the two objects, their respective populations, economic indicators, and other factors that may influence the interaction between the two objects.

The most common form of a gravity model is the Newtonian model, which is based on Isaac Newton’s law of universal gravitation. This model assumes that the force between two objects is proportional to the product of their masses and inversely proportional to the square of the distance between them.

Gravity models are a powerful tool for predicting the interaction between two objects and can be used to make informed decisions about the allocation of resources and the design of infrastructure. They are also useful for understanding the dynamics of a system and for making predictions about the future.