Paul Graham is a great guy but he is now more an investor than an entrepreneur (or at least that is how he functions with Y Combinator). We should therefore realise that when he says that he prefers to invest in companies with more than one founder, he is saying this from the perspective of an investor.<p>And from the point of view of an investor, it makes a lot of sense to have more than one founder. You invest about the same amount as you would with a single founder business but you get double or more the passionate people working desperately to make the business work.<p>From the point of view of a founder, however, things are very different. Get in a cofounder and you have immediately halved your stake and possible payout. You have also lost a lot of control. You are no longer in complete control of the company - many decisions now has to vetted by your cofounder. Not necessarily a bad thing but there is something to be said - from a self-actualisation perspective - for having complete responsibility for your destiny.