Hotelling's law
（重定向自Principle of minimum differentiation）
![Two pharmacies on the main street in Mrzeżyno. Possibly an effect of Hotelling's location competition.](/Images/godic/202502/04/Mrzezyno2Apteki5500.jpg")
- Not to be confused with Hotelling's rule.
Hotelling's law is an observation in economics that in many markets it is rational for producers to make their products as similar as possible. This is also referred to as the principle of minimum differentiation as well as Hotelling's linear city model. The observation was made by Harold Hotelling (1895–1973) in the article "Stability in Competition" in Economic Journal in 1929.