Rising wage pressure in this category signals that these occupations are experiencing shortages of workers with the necessary skills. (hays-index.com)
The concerns are often focused on shortages of workers with skills in STEM subjects but increasingly also on «soft skills» like problem solving, team working and communication. (sciencedaily.com)
Most likely that would come from taxes on those who were also working, which would erase any benefit that they got and act as a disincentive for many to work (opponents to the UBI in Switzerland made that case, suggesting it would lead to a flat out shortage of workers). (relentlesseconomics.com)