Columbia subject headings:
Human capital--Mathematical models.
Human capital--United States--Mathematical models.
Income distribution--Mathematical models.
Income distribution--United States--Mathematical models.
Harvard subject headings:
Human capital--Mathematical models.
Human capital--United States--Mathematical models.
Income distribution--Mathematical models.
Income distribution--United States--Mathematical models.
Princeton subject headings:
Human capital--Mathematical models.
Human capital--United States--Mathematical models.
Income distribution--Mathematical models.
Income distribution--United States--Mathematical models.