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Barrels are very difficult to find. But when you have them, give them lots of equity. Promote them, take them to dinner every week, because they are virtually irreplaceable because they are also very culturally specific. So a barrel at one company may not be a barrel at another company. One of the ways, the definition of a barrel is, they can take an idea from conception and take it all the way to shipping and bring people with them.

"Lecture 2: Ideas, Products, Teams and Execution Part II". "How to Start a Startup" lecture, Stanford, genius.com. September 25, 2014.
Barrels are very difficult to find. But when you have them, give them lots of equity. Promote them, take them to dinner every week, because they are virtually irreplaceable because they are also very culturally