Final answer:
Geert is likely to address his growth and labor challenges by employing industrial psychology, which would involve job analysis, staff training, and workplace improvements.
Step-by-step explanation:
If Geert adopts the principles of behavioral management theory, he is most likely to address his immediate concerns using industrial psychology. This approach focuses on understanding and improving the performance and well-being of employees within an organization. Industrial psychology would allow Geert to develop strategic methods for personnel selection, training, and improving the work environment to enhance productivity, which is particularly useful in a situation of rapid growth and labor shortages.
Using the core concepts of industrial psychology, Geert could initiate job analysis to optimize labor use, implement training programs to upskill existing staff, and apply scientific methods to improve the workplace environment, thus addressing both the growth and the shortage of labor. By doing so, he would apply a tailored approach that is most likely to result in both improved company output and worker satisfaction.