According to leaked documents, only a third of Amazon's new hires stayed for more than 90 days. The report shows that Amazon has serious issues retaining employees, and that the company estimates that its attrition rate costs it $8 billion a year.

According to the report, workers are twice as likely to leave by choice if they are laid off or fired. The lowest attrition rate for one of the company's 10 tiers of employees was almost 70 percent, and the highest was almost 81%.

It's well known that Amazon's warehouses and other fulfillment facilities have more turnover than the rest of the industry, but the report doesn't say which class of employees had the highest attrition rate. According to a report from The New York Times, around three percent of the company's hourly employees leave each week, and leaked internal memos show that the company is worried about running out of people who would be willing to work for it within the next few years.

There is an attrition issue.

While some Amazon warehouse workers have made it clear that they don't want to stay in those roles, managers are also leaving due to issues with "development and promotions," or other advancement issues at Amazon. The training programs the company provides, which are important for moving up at Amazon, but seem to be run in a disorganized and potentially wasteful manner, may be the reason for some of this. There was no response from Amazon on the report.

Amazon has been criticized for how it manages as well as it has been criticized for people leaving layoffs. According to reports last year, Amazon didn't let employees who were at risk of losing their jobs know that they could work on improving their performance if they wanted to. There were concerns about the role of automation in the company's process for tracking warehouse employees' performance and firing them if they failed to meet up to the company's strenuous standards.