Clay Voorhees, Michigan State University (IMAGE) Michigan State University Caption A study co-authored by Michigan State University marketing expert Clay Voorhees suggests the presence and behavior of other customers is just as important to brand loyalty as customer service. Credit Michigan State University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.