Because it's one of these sort of connections between nodes- every pair of people adds communication overhead.

You should always know how you're doing against your metrics. You should always have a weekly review meeting every week.

You also really want to take the time to think about how the market is going to evolve.You need a market that's going to be big in 10 years.

Here's a good rule of thumb: don't worry about a competitor at all, until they're actually beating you with a real shipped product.

Facebook has this famous poster that says move fast and break things. But at the same time they manage to be obsessed with quality.

In YC experience, 2 or 3 co-founders seems to be about perfect.

In the beginning of a company, there is no management and this actually works really well.