we have two ears and one mouth and we should use them proportionally

In the first study, Grant and his colleagues analyzed data from one of the five biggest pizza chains in the United States. They discovered that the weekly profits of the stores managed by extroverts were 16 percent higher than the profits of those led by introverts—but only when the employees were passive types who tended to do their job without exercising initiative. Introverted leaders had the exact opposite results. When they worked with employees who actively tried to improve work procedures, their stores outperformed those led by extroverts by more than 14 percent.

Indeed, your biggest challenge may be to fully harness your strengths. You may be so busy trying to appear like a zestful, reward-sensitive extrovert that you undervalue your own talents, or feel underestimated by those around you. But when you’re focused on a project that you care about, you probably find that your energy is boundless.

...I also believe that introversion is my greatest strength. I have such a strong inner life that I’m never bored and only occasionally lonely. No matter what mayhem is happening around me, I know I can always turn inward.

(Finland is a famously introverted nation. Finnish joke: How can you tell if a Finn likes you? He's staring at your shoes instead of his own.)

Studies have shown that performance gets worse as group size increases ... If you have talented and motivated people, they should be encouraged to work alone when creativity or efficiency is the highest priority.

I get a lot of letters from introverts asking how they can meet people. The key is to make sure that you are doing things you enjoy.