Being a large powerful retailer, Walmart has done each of these, EXCEPT which one?

Walmart has demanded that their overseas suppliers pay their workers based on U.S. standards.

Walmart has controlled its suppliers' access to customers by demanding suppliers reduce their prices.

Walmart has changed the frequency of payment to some vendors, tying payments to how quickly a supplier's inventory is bought.

Walmart has demanded additional fees from U.S. suppliers for using its distribution centers and warehouses.

Walmart has bought only from competitors of a supplier, if the supplier refuses to reduce their prices.