Why did the layoffs of workers as a result of the Great Depression make it difficult to resume production growth?

Since professionals were fired, people who were ready to work for less remuneration came to their places, but without work skills (qualifications), as a result of which the productivity of labor, both qualitatively and quantitatively, fell.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.