Superstar employees are the obsession of the corporate world. They’re highly sought after, given the most attention and the best opportunities, generously rewarded, and expressly reassured after setbacks. And while some question whether such special treatment is appropriate, it’s clear that this group has outsize influence: high-performers have been estimated to be four times as productive as average workers, and research has shown that they may generate 80% of a business’s profits and attract other star employees. They can comprise the top 3% to 20% of a company’s workforce.