In the early 1990s, several studies pointed out a significant gap in earnings between engineers in private firms working in Research and Development (R&D) and those in other activities. The purpose of this article is to assess, from conventional Mincerian models, to what extent these findings are still valid. The different levels of responsibility and job satisfaction of engineers in both types of activities are also analysed. The results clearly suggest a lower remuneration for engineers working in R&D in comparison to other activities, all things being equal. On the other hand, engineers involved in R&D activities have a greater dissatisfaction about the remuneration they receive, but also concerning many aspects of their work. These results lead to questions about the place of R&D within companies, in a knowledge-based economy.