Similarly under the CCCP, in order to move from Moscow to St. Petersburg (or any other city for that matter), a person had to find another person in St. Petersburg who wanted to move to Moscow. Otherwise the Mayor of Moscow would be faced with the situation that his old buddy, the mayor of St. Petersburg, had just gone one up on him. The basic idea in play was literally a medieval conception of ownership leftover from the days of serfdom, and that is also clearly what is happening in those Houston school districts.
Great analogy.