This year’s McKinsey & Company retreat in China was one to remember. Hundreds of the company’s consultants frolicked in the desert, riding camels over sand dunes and mingling in tents linked by red carpets. Meetings took place in a cavernous banquet hall that resembled a sultan’s ornate court, with a sign overhead to capture the mood. “I can’t keep calm, I work at McKinsey & Company,” it said. Esp