Not so much volume, but just the different options available. Example, if food is subsidized, then food vendors can increase prices to soak up the excess. But if people just get money, and food vendors try to soak it up, people can spend their money on building a greenhouse and growing their own vegetables. If every industry tries to raise prices, at some point it becomes worthwhile for people to do things themselves, then trade with each other, undercutting the larger industries. Basically, the libertarians’ wet dream could actually happen with UBI.