I think the answer is yes. Also, if everyone just gets $X, will prices also rise by some Y close to X as people will feel less attachment to this $X as it was f

I think the answer is yes. Also, if everyone just gets $X, will prices also rise by some Y close to X as people will feel less attachment to this $X as it was free? I've yet to see a truly thoughtful model of what all will happen. For example, UBI is said to replace all the bureaucracy of today's welfare programs. That is a lot of people that will lose their jobs, including the cycle of the people who used to supply goods and services to those people. Some of those companies will close and layoff more people, etc., etc. It doesn't go infinite but it definitely cascades. We can see proof of this in old steel towns or some place like Detroit. As good jobs dry up, it starts an economic slide.