From Mind Hacks:

Not Exactly Rocket Science covers an intriguing study on how people try less hard in a competition as the number of competitors increases.

The researchers started off with a simple observation that US students tended to get better marks when they took their exams in smaller exam rooms.

This brings up one of the reasons why you might not want to grow your team or business too much. When you have 50 designers, will they all work as hard and be as creative as when you had five? Will you still be the team you used to be?