If say, a liberal state in the US like California wanted to do a useful study on the subject, the way to do it would be to randomly choose a pair of nearby citi

If say, a liberal state in the US like California wanted to do a useful study on the subject, the way to do it would be to randomly choose a pair of nearby cities/counties with similar composition, then impose both a basic income stipend and the extra taxes needed to pay for it on one of the counties and not on the other, for a minimum period of 10 years. You could even choose the specific city/county pairs from only those that wanted to take part in the experiment and had voted to that effect in a ballot proposition. Then you could answer important questions regarding effects of the increased taxes as well as that of the payments. I'd be particularly interested in 2nd order effects, for example, if the voters can vote to keep increasing the basic income amount, would the increased taxes eventually drive out those who are taxed most heavily? And would that be net negative (reduced tax revenue to fund the program)? Or net positive (e.g. reducing housing prices?)