Walmart's CEO said Thursday that tariffs on China have had the "biggest impact" on costs as he announced that the world's largest retailer will likely raise prices late this month as a result. "All of the tariffs create cost pressure for us, but the larger tariffs on China have the biggest impact. The cost pressure from all the tariff-impacted markets started in late April and it accelerated in May," CEO Doug McMillon said on the company's earnings call. "We will do our best to keep our prices a