Why competing gas stations cluster on the same stretch
The pattern can be explained with a simple location game. Imagine drivers spread along a straight road and choosing the station that adds the least detour. Each station wants to attract customers from the other’s side of the road as well as its own. That creates pressure to move toward the area where the most undecided drivers pass.
The key idea is Nash equilibrium: a situation in which no player can improve its result by changing strategy alone, while the others hold still. If one station moves closer to the middle, it may capture drivers who would otherwise stop at its rival. The rival then has reason to move in the same direction. When neither can gain much by shifting on its own, the two can end up close together.
A stable outcome is not always the best one for drivers
This is a simplified version of a model of competing businesses choosing locations. It assumes, among other things, that customers are distributed along a line and mainly choose based on distance. Under those assumptions, clustering can be a stable strategy for the stations—even if spreading them out would make trips shorter for drivers overall.
Real roads add complications: traffic flow, access to an intersection, land prices, zoning, fuel prices, and nearby destinations all affect where a station can succeed. So the model does not explain every pair of rival pumps. It does explain why competition alone does not always push businesses apart: each station may be safest by staying near the customers its rival is trying to win.
