1) Reilly published The Law of Retail Gravitation in 1931 after he realized that Newtons Law of Gravitation seemed to loosely express the empirical regularities he observed while conducting several trading area investigations for chain grocery stores in Texas during the late 1920s (Reilly, 1929).
If one adopted this hypothesis, then the law of retail gravitation could be used to calculate the breaking point" between two places, where customers will be drawn to one or another of two competing commercial centers (Anas, 1987, pp.
60) findings reinforced previous studies and again found that Reilly's law of retail gravitation provides a remarkably accurate delineation of the Charlotte retail trading area.
Scholars, retail executives, real estate investors, and urban planners enthusiastically embraced Reilly's Law of Retail Gravitation as an iron law of retail trade distribution, but at the same time a number of methodological amplifications were introduced in the 1960s and 1970s which culminated in the introduction of the "Huff model" (Applebaum, 1965, p.
The Huff model, which was first articulated in two articles published I in 1963 and 1964, incorporated these four modifications to Reilly's Law to construct an alternative model of retail gravitation based on consumer behavior theory and goods theory, rather than central place theory.
36) noted that his model "resembles the original model formulated by Reilly" but he argued that it differed from Reilly's Law of Retail Gravitation "in several important respects.
The study of the ways in which retailers make their location decisions can be traced back as far as the works of Haig[1,2] and the competitive bidding for specific sites based on anticipated future returns; Hotelling's explanation of the clustering of similar stores; Reilly with the famous Law of Retail Gravitation combining the effects on patronage of both distance and centre attractiveness; and Christaller's focus on the "real price" of a good which includes a notional transportation "cost".
The gravity model used by the retailers in the sample stems from the deductively derived spatial interaction theory, being a modified version of Reilly's Law of Retail Gravitation.
The Law of Retail Gravitation, Knickerbocker Press, New York, NY, 1931.