(Bloomberg)—“Very wasteful” isn’t a phrase usually associated with Amazon.com Inc., which is so cost-conscious it once removed the light bulbs from its cafeteria’s vending machines. But after spending several months analyzing the online retailer’s grocery-shipping hubs back in 2014, that’s exactly how a mechanical engineering student described its approach to selling bananas. Workers at Amazon … Continue reading How Amazon is trying to get a handle on grocery sales