I for one am glad Finland is doing this. It will save my country from being this generation's lab rat. It seem very couple of decades we need to relearn that price fixing doesn't work. I would have hoped the Venezuelans spectacular meltdown would have been enough, but it guess not.
Economics is all about whats happening at the margins. The marginal utility of going from $0->$5 per day in income is much greater than from from $200->$205. By giving everyone (this study is only starting with a few) a guaranteed fixed income you've just hugely reduced the utility of a working a low paying job. If you're getting nothing a job that pays $30,000 is a huge improvement because you have lots of time and no money. If you're getting $20,000 UBI you have lots of time and some money, the value of going from $20,000 to $50,000 won't be worth it to some people. In order for the low paying job to have that same marginal utility it's going to need to pay a lot more. Which raises the price of everything, which means that $20,000 doesn't go as far. Yay inflation! The market will readjust, and keep readjusting, until you relearn that price fixing doesn't work.