TIM KOLLER is a partner in McKinsey's Stamford, Connecticut office, where he leads a global team of corporate-finance expert consultants. Tim has served clients globally on corporate strategy and capital markets, mergers and acquisitions transactions, and strategic planning and resource allocation. MARC GOEDHART is a senior expert in McKinsey's Amsterdam office and endowed professor of corporate valuation at Rotterdam School of Management, Erasmus University (RSM). DAVID WESSELS is an adjunct professor of finance at the Wharton School of the University of Pennsylvania. He was named by Bloomberg Businessweek as one of America's top business school instructors. MCKINSEY & COMPANY is a global management-consulting firm that serves leading global organizations across a wide range of industries and functions, helping them create change that matters.