Turnover in some positions is very high. For instance Amazon is notorious for its high turnover ate and oppressive working conditions in its warehouses. $70\%$ of new hires leave within $90$ days, costing Amazon an estimated $$8$ billion every year. Amazon$$ also used invasive tracking systems and irrational performance metrics and was ranked as one of the worst companies for employee retention. It seems that Amazon did not put much efforts in retaining warehouse employees. Why? what Amazon could do to improve warehouse's employee retention$$