Susan Linz, Michigan State University (IMAGE) Michigan State University Caption Susan Linz, economics professor at Michigan State University, led the first large-scale study that found a link between worker loyalty and increased earnings. 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.