[brc]

Except that the marginal cost of production will go up because of the increased competition for scarce goods, of which every single produced item has some component, not the least of which is land and labor.

So yes, there is likely an inflationary effect, but it is impossible to accurately predict.

It also depends on the net change in people's overall income as most basic income proposals include scrapping piecemeal and overlapping welfare systems.

Personally I think I could be convinced if it was essentially a replacement and thus simple to administer, but would have to be coupled with strict immigration control for the first country to try it.