Affiliation: | 1. UCP, Católica Lisbon — School of Business and Economics, Portugal;2. Tilburg University, P.O. Box 90153, 5000 LE Tilburg, The NetherlandsTel.: + 31 13 4663256;3. fax: + 31 13 4668354.;4. Tilburg University, P.O. Box 90153, 5000 LE Tilburg, The NetherlandsTel.: + 31 13 4668276;5. fax: + 31 13 4662067. |