1. University of Stellenbosch Department of Business Management, 121389, Stellenbosch, Western Cape, South Africa;
2. The University of Pennsylvania, The Wharton School, Philadelphia, Pennsylvania, United States;
3. The University of Pennsylvania, The Wharton School, 3620 Locust Walk, 3115 Steinberg Hall-Dietrich Hall, Philadelphia, Pennsylvania, United States, 19104-6370, , ;