>but maybe I should write up a more detailed blog post about it? Yes you should write more about this. It's fascinating. And to answer your previous question

>but maybe I should write up a more detailed blog post about it? Yes you should write more about this. It's fascinating. And to answer your previous question about whether the college would get a percentage of your farm income, I would have to say yes. The option of limiting their stake to a particular profession would introduce too many loopholes. For instance I could get a math degree, and sign something giving them a share of all future earnings as a mathematician--then work as a programmer instead. That being said I'm sure there could be some sort of maximum. Student loans already work somewhat similarly. There is an option to pay off loans based on a percentage of your total income, so you are in effect paying x percent of your income for y number of years.