Walmart has announced it is counting the number of customers in its stores to limit the spread of COVID-19. The retailer is also placing quantity limits on items such as toilet paper to prevent the hoarding that took place when the pandemic first broke out in the U.S. earlier this year... DoorDash has seen demand for its delivery service boom during the pandemic. The company's share of the meal delivery market grew to 49% in December, according to Second Measure. Despite exponential growth in orders, DoorDash reported a loss of $149 million in the latest quarter, an improvement from $533 million in losses last year...