Reilly's law of retail gravitation
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Reilly's Law of Retail Gravitation, in economics, states that larger cities will have larger trade areas than smaller ones, meaning people travel further to reach a larger city.
The law presumes the geography of the area is flat without any rivers, roads or mountains to alter a consumer's decision of where to travel to buy goods, it also assumes consumers are indifferent between the actual cities.
The law was developed by William J. Reilly in 1931.
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BP= d/ (1+ (sqrt(p1/p2)) where d is distance and p1 and p2 are the places between which the distance exists, the answer will give the distance from p2 .. this is also called a break-point. The break point is ... for example.. you are leaving a store.. let's call it store a and you forget something that you wanted to buy when you left.. it just so happens that you are headed towards an alternative store b... the breakpoint would be the point at which you would travel towards store b instead of store a because of it's "gravity".. this would happen sooner in theory if store b is an alternative store with greater square footage. For example if you are halfway between the stores and store b has more square footage, this suggests that you are more likely to go to store b (BP is for break point) Place1 and Place2 are given as a form of gravity.. gravity can be a number of things but as a rule square footage seems to work the best.
