Grocery stores have coupons and customer discounts, employees can make different wages doing the same job, and car dealers absolutely give deals to some clients

Grocery stores have coupons and customer discounts, employees can make different wages doing the same job, and car dealers absolutely give deals to some clients that they won't give to others. Public utilities are an exception, and that's specifically because they're government regulated. But we're discussing commerce here and in commerce, prices are rarely the same for everyone.