Personally, I would prefer that the government or community would "care" through all your life as USSR did. Selling yourself as a slave to the private investor or corporation is inhumane and I think these contracts won't be ever enforced in the most countries!
Giant the thing is, this is something that a person isn't necessarily forced to do; I don't have to all of a sudden give all my shares to someone because its being enforced, however instead of the world using a debt based economy particularly for mortgages car loans etc, having an optional legal statute in place to allow a person to sell part ownership of his future earnings (and part of his freedom) in exchange for a product he may never be able to afford would be a reasonable idea.
Those shares of course could then be resold to companies/individuals that are dedicated to maximising individual potential (which is IMO virtuous) and could eventually be bought back by the individual who sold himself in the first place, similar to a highly regulated security.
for example (from the book):
1% of your person is given to the government as a form of taxes, 10% to your parents (by du jure but could be given back if desired), the remaining 89% is yours to keep until you desire high-school/university or are desperate for a job to survive.
Personally for the past 6 months I've been looking for work as an engineering graduate, and if there was an option of selling part ownership of my future earnings in exchange for not having to sleep on my 76 year old fathers couch for 5 months and essentially be a live-in nurse I would do it, albeit not overnight, but just having the option open I believe would make the vast majority of humanities quality of life increase dramatically. We would actually have a reason that wasn't derived from moral judgement to care about other people.