Final answer:
The key performance driver tied to human capital investments is employee turnover.
Step-by-step explanation:
The key performance driver that is tied to human capital investments is employee turnover.
Investing in human capital, which refers to the education, skills, knowledge, and health of workers, is crucial for improving productivity and overall business performance. Employee turnover, which measures the rate at which employees leave a company and are replaced by new hires, is directly affected by human capital investments. By hiring and developing skilled, qualified, and motivated workers, businesses can reduce employee turnover and create a stable and productive workforce.