Lots of talk in absolutes. Prices will go up - but not exactly as much as income goes up, because (lots of other economic pressures).

Its easy to play a game of FUD (fear; uncertainty; doubt) but the answer is None of the Above. A BI will change things sure. But so did pensions, and insurance, and retirement plans. They didn't bring the economy down in flames; neither will a BI.

Remember the spending of the poorest among us does not drive the entire economy. Wages will change, a little. Prices will change, a little.