Earlier quoted context omitted.
I’m so confused why this inflation argument keeps popping up. If you’re paying for the Ubi with taxes then there’s no inflation. Net money supply hasn’t changed (0). If you pay for ubi by printing money then yes, inflation would be a problem. But no one has suggested that. (0) I’m willing to entertain an argument about the velocity of money increasing from ubi but I really doubt it would be too significant.
Rich people aren't spending all their money on stuff, they're investing it. If wealthy people were to take all that wealth and start buying stuff (themselves or via redistribution through taxes to UBI), there isn't magically more stuff, so the price of stuff goes way up => inflation.
Most companies can easily ramp up production to meet increased demand. It's not magic, it's the modern world.
Most general goods companies are demand constrained, that's why they need to do marketing campaigns to make more sales. It's only if they had too many orders and couldn't grow production that we'd have inflation. So there may be some inflation immediately but not long term.