There's this side concept called competition. If you sell your bread for $6 because you think the market can afford it, but the vendor next door continues to sell for $3 you go broke.
I didn't always see eye to eye with Milton Friedman, but I think we can give him credit that he'd thought through the obvious problems with this approach before he proposed it.
Except that your costs go up as well. There will be an added tax burden, for one. Since only one in three Americans works, you'll have to pay for a lot of taxes. Then you've got to buy the flour. Your next door neighbor didn't just walk in one day and raise his prices to $6.00. The costs of the flour rose. The eggs. The yeast. The labor that creates the bread increased in cost as well, since nobody wants to work for minimum wage when there's all this free income now and the increased cost of labor shuts out newcomers, thereby reducing competition. Eventually, you have to raise prices not out of greed but because if you don't you'll be losing money and then you'll need to rely on your basic income and so will all the people you used to employ.
I didn't always see eye to eye with Milton Friedman, but I think we can give him credit that he'd thought through the obvious problems with this approach before he proposed it.