Parents who pay for their children’s education are effectively investing in their child’s human capital. A student could similarly offer the opportunity to buy the equivalent of bonds in their education: the investor pays a fee up-front with the promise of a percentage of the student’s career in the future.

Boxing managers will train a boxer for a small fee or even for no money, owning percentage shares of their fighters’ earnings. A parallel in the movie industry is the percentage that agents take from their clients’ future earnings.