Money Amazon, Walmart may be starting a shipping war. FedEx, UPS will need to keep up or get shut out. February 5, 2019 Daniel B. Kline, The Motley Fool Comments Off on Amazon, Walmart may be starting a shipping war. FedEx, UPS will need to keep up or get shut out. To stay competitive, both retail companies are adding drivers, trucks, and higher salaries with plans to add more.