Citing an iffy economic outlook, Amazon has upped planned layoffs from 10,000 to more than 18,000 employees, including staff from its retail stores. CEO Andy Jassy said in a blog update on Wednesday that the job cuts will come mainly from the e-tail giant’s Amazon Stores; People, Experience and Technology (PXT); Amazon Devices and Amazon Books units. Jassy had announced plans for job eliminations in mid-November but didn’t quantify the number of expected layoffs.