Human Capital Models

Accurately estimating the value and volatility of human capital is a complex task. Various models and approaches have been developed to address this challenge, each with its own set of assumptions and limitations. Some common methods include:

Income-Based Models

These models project future income streams by considering current earnings, expected growth rates, and discount rates. They also take into account factors like age and career trajectory. For example, a simple income-based model might estimate future earnings by assuming a constant growth rate and discounting those earnings back to their present value.

Stochastic Models

These models incorporate uncertainty and randomness into income projections, allowing for simulations and probabilistic assessments of human capital value.⁸⁵ For instance, a stochastic model might use Monte Carlo simulations to generate a range of possible future income paths, taking into account factors like job loss or unexpected career changes.

The Mincer Model

This econometric model, developed by Jacob Mincer as the Mincer earnings function, estimates human capital value by considering factors such as education, experience, and on-the-job training.⁸⁵ It assumes that individuals invest in their human capital to increase their productivity and earnings.

Residual Approaches

These methods estimate human capital indirectly by subtracting the value of tangible assets from an individual’s total wealth. This approach assumes that total wealth is composed of both tangible assets (like financial investments and real estate) and intangible assets (like human capital).

The discount rate you apply to that future income stream is not the market’s expected return. It is the risk-free rate plus a premium for the illiquidity of human capital and for the market risk carried by your particular income — a partner at a cyclical firm discounts harder than a tenured professor. The direction of the effect is what matters for planning: a higher discount rate lowers the present value of human capital, and a lower human capital value reduces the amount of life insurance you need to hedge it.⁸⁶