Let's make a deal
In 2012, Facebook agreed to acquire Instagram for $1B - a decision that the respective founder-CEOs came to over a fascinating email exchange. To know the absolute clarity of thought (and speed) that went into this high stakes decision, read this publicly available memo.
Reading time: ~10 minutes
Psst: While we don't reveal trade secrets, some sources are too good to be hidden. A big shoutout to the original repository, where you can find more such cool memos: https://sriramk.com/memos.