1. Center for Business and Economic Research, 105 Temple CourtUniversity of TennesseeKnoxvilleTN37996‐4334USA
2. Center for Business and Economic Research, 101 Temple CourtUniversity of TennesseeKnoxvilleTN37996‐4334USA
3. Department of Economics and International Business, 237A Smith‐Hutson BuildingSam Houston State UniversityHuntsvilleTX77341USA