(Extracted from Zero to One by Peter Thiel)
for equity to create commitment rather than conflict, you must allocate it very carefully. Giving everyone equal shares is usually a mistake: every individual has different talents and responsibilities as well as different opportunity costs, so equal amounts will seem arbitrary and unfair from the start. On the other hand, granting different amounts up front is just as sure to seem unfair. Resentment at this stage can kill a company, but there’s no ownership formula to perfectly avoid it.
This problem becomes even more acute over time as more people join the company. Early employees usually get the most equity because they take more risk, but some later employees might be even more crucial to a venture’s success. A secretary who joined eBay in 1996 might have made 200 times more than her industry-veteran boss who joined in 1999. The graffiti artist who painted Facebook’s office walls in 2005 got stock that turned out to be worth $200 million, while a talented engineer who joined in 2010 might have made only $2 million. Since it’s impossible to achieve perfect fairness when distributing ownership, founders would do well to keep the details secret. Sending out a company-wide email that lists everyone’s ownership stake would be like dropping a nuclear bomb on your office.