1. Statistics Canada, Ottawa, Ontario K1A 0T6, Canada;
2. Department of Entrepreneurship and Management, Henry W. Bloch School of Management, University of Missouri–Kansas City, Kansas City, Missouri 64110;
3. Department of Management and Organizations, Leonard N. Stern School of Business, New York University, New York, New York 10012;
4. Operations, Information and Decisions, The Wharton School, University of Pennsylvania, Philadelphia, Pennsylvania 19104