The choice of a study program is based on complex individual decision-making processes. Thereby, economics is one of the most popular fields of study worldwide. Considering previous studies, the role of the teacher is often neglected. However, it can be assumed that teachers’ professional knowledge plays a significant role in a student’s choice of a study program. Thus, the present study investigated the influence of the professional knowledge that students perceive in their economics teacher on their aspirations and choice of an economics study program. The longitudinal data of 1387 Swiss high school students were analyzed. Economic competencies were measured multidimensionally and included knowledge, motivation, interest, value-oriented dispositions, and attitude. There were small to moderate correlations between the professional knowledge that students perceived in their economics teacher and their economic competencies. With regard to the intention and choice of economics, the results show small to moderate effects of the pedagogic content knowledge and the general pedagogic knowledge that students perceive in their teacher. These findings contribute to the discussion on the role of the economics teacher. It is therefore recommended that the teaching professionalism of economics teachers, which has been criticized in different countries, be promoted more strongly and more systematically.