This is not a new idea of course, but it would, I think, be very hard to sell politically. There will be the same objections raised against the idea of farmers being paid not to plant, which is very unpopular accept among farmers. (That idea was sold at a time of a national crisis in farm prices. It seems it came in under Ezra Benson.) Would your idea be difficult to administer fairly? Probably. What criteria would you propose be used to decide who would get payments for not having children. . And then I suppose you'd reduce the payment some for each additional child born so that there would be a definite negative incentive to have more children. Political correctness makes these schemes difficult to pull off. People worry about harming the children, which is ironic when one considers the situation that many of these welfare children find themselves in as things stand now.. I'm not suggesting its a bad idea mind you, just pointing out the difficulties that have to be got around to implement something like this.. Certainly worth exploring.