… I always figured that gas stations clustered together to minimize the distance long haul drivers would need to go to get to a gas station. I.e., they're clust

… I always figured that gas stations clustered together to minimize the distance long haul drivers would need to go to get to a gas station. I.e., they're clustered, but near highways. The same logic doesn't apply to pharmacies: I don't have a sudden need for drugs on the road. (I'm not sure how much I actually buy the mathematics in the article.)