John Marshall Harlan II,
West Point Wholesale Grocery Company v…
“ This is particularly so in that Opelika places no comparable flat-sum tax on local merchants. Wholesale grocers whose deliveries originate in Opelika, instead of paying $250 annually, are taxed a sum graduated according to their gross receipts. Such an Opelika wholesaler would have to gross the sum of $280,000 in sales in one year before his tax would reach the flat $250 amount imposed on all foreign grocers before they may set foot in the City. [3] The Commerce Clause forbids any such discrimination against the free flow of trade over state boundaries. ”
