Coinspeaker Walmart, Amazon, Costco Stocks Rise as Retailers Ramp Up COVID-19 Safety MeasuresWalmart, Amazon, Costco stocks are up as they implement measures to protect employees and customers from coronavirus. The measures include sanitizing efforts, temporary changes of working hours and recruiting more people to handle increasing demand.Walmart, Amazon, Costco Stocks Rise as Retailers Ramp Up COVID-19 Safety Measures