Sales taxes are calculated on the gross, not the COGS, so it's not the same. It's also different by locality. But yes, the same principle applies: huge retaile

Sales taxes are calculated on the gross, not the COGS, so it's not the same. It's also different by locality. But yes, the same principle applies: huge retailers negotiate for better margin. Any tax on the retailer can be theoretically negotiated back to the seller.