That's not my point. Yes, someone poor benefits greatly from a dollar store, but they're paying a premium that someone that is more wealthy does not pay because

That's not my point. Yes, someone poor benefits greatly from a dollar store, but they're paying a premium that someone that is more wealthy does not pay because the wealthy person can take advantage of economies of scale: a wealthy person can buy 100 rolls of toilet paper for $50 where a poor person can only buy one roll for $1. This extends beyond just the dollar store. A wealthy person has access to a vehicle which allows them to go to Costco that is 10 km away. A wealthy person has storage in their home to house the discounted goods they buy. A wealthy person has access to financing and financial investments that a poor person does not; you cannot buy a portion of share of stock.