But more often the real shock of growth is that over time you’ll bring on people who are just okay. Relative to the amazing people you brought in early, they’ll seem unimpressive. Mostly fine, good team players, get the job done.

And that’s not the end of the world. As the company expands, you need all kinds of people at all kinds of levels.

You can’t wait for the perfect A+ candidate to appear for every single empty slot. You need to hire. The best of the best don’t always want to join a big team, or they’re tied up in another job, or you can’t afford them or give them the titles or responsibilities they want.

And sometimes the people you don’t expect to be amazing—the ones you thought were Bs and B+s—turn out to completely rock your world. They hold your team together by being dependable and flexible and great mentors and teammates. They’re modest and kind and just quietly do good work. They’re a different type of “rock star.”

By far the hardest part of growth is finding the best people—in all their different incarnations—trusting your team to hire them, then making sure they’re happy and thriving.

We learned that a company with really dense talent is a company everyone wants to work for. High performers especially thrive in environments where the overall talent density is high.

Our employees were learning more from one another and teams were accomplishing more—faster. This was increasing individual motivation and satisfaction and leading the entire company to get more done. We found that being surrounded by the best catapulted already good work to a whole new level.

But for all creative jobs we would pay one incredible employee at the top of her personal market, instead of using that same money to hire a dozen or more adequate performers. This would result in a lean workforce. We’d be relying on one tremendous person to do the work of many. But we’d pay tremendously.

This is the way we have hired the majority of employees at Netflix ever since. The approach has been remarkably successful. We have exponentially increased our speed of innovation and our output.

By avoiding pay-per-performance bonuses you can offer higher base salaries and retain your highly motivated employees. All this increases talent density. But nothing increases talent density more than paying people high salaries and increasing them over time to assure they remain top of market.

To achieve the highest level of talent density you have to be prepared to make tough calls. If you’re serious about talent density, you have to get in the habit of doing something a lot harder: firing a good employee when you think you can get a great one.

One of the reasons this is so difficult in many companies is because business leaders are continually telling their employees, “We are a family.” But a high-talent-density work environment is not a family.