The best replacement for human capital is human resources.

The best alternatives to human capital are rated as following:
★★★★★  human resources
★★★★★  social capital
★★★★  physical capital
★★  labor
★★  cultural capital
★★  financial capital
★  signaling
★  intellectual capital
  signalling
  talent management
  signaling model
  human resource
  human development
  natural capital

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Speaking about human capital, one probably shouldn't forget about solow growth model.

Other search terms related to human capital and their ratings are:
★★★★★ solow growth model
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human capital
human resources
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