Amazon is instructing corporate staffers to spend five days a week in the office, CEO Andy Jassy wrote in a memo on Monday.The decision marks a significant shift from Amazon's earlier return-to-work stance, which required corporate workers to be in the office at least three days a week. Now, the company is giving employees until Jan. 2 to start adhering to the new policy.Here's the full memo from Amazon CEO Andy Jassy: Hey team. I wanted to send a note on a couple changes we're making to further strengthen ...