Seems Dana Mattioli’s book that covers Amazon has some juicy stories:

“After stumbling upon the secret Trader Joe’s room at Amazon’s Seattle headquarters, things only became more stressful for the former Trader Joe’s employee. For six months, her manager hounded her for information about the grocer’s bestselling products. She tried to deflect, but the pressure kept ratcheting up. Finally, the manager demanded that the employee email any documents she had kept from her time at Trader Joe’s to another colleague on the team. She emailed over an Excel spreadsheet that detailed Trader Joe’s top-selling items nationally over the course of a week. It contained the number of units sold per item over that time period.

Her manager didn’t stop with the sales data. He also demanded that she share Trader Joe’s margins for each product. When she refused, her manager angrily screamed at her, “You just have to give us the data!” a person who witnessed the exchange recalled. The employee, who had been pressured for months, burst into tears. But she declined to share the margins data.”