Oh, I get what you're saying now. Thanks for the clarification. You're right that without anything in place to prevent it, universal basic income can fall prey to something similar to a tragedy of the commons. You're also right that its vulnerable to changes in population, with both huge swings up and down turning into a tax with low projected benefit once its split among the population. Definitely a severe structural problem, which would make putting more explicit population control mechanics into the system important if it were widely adopted.