> I am not at all an economist, but I wonder: if everyone had the same amount of fixed income (in addition to whatever else they made from their jobs), wouldn't there would be continual inflation, rendering that money worthless?
Not necessarily. You'd expect some inflation, but if the level of basic income was set at a low enough level (what that is depends on the overall productivity of the economy) it wouldn't be "continual" (well, if you exclude all other effects on price level but the basic income and its effect on price and the effect of that price change on wages, and the effect of those wage changes on price, etc., the effect might be "continual", but it would be asymptotically approaching a finite limit, so not unbounded, which is really where there would be a problem.)
> Also: How does Macdonalds work in this situation, if the fixed income "replaces" minimum wage. Does Macdonalds pay on top of this wage?
Yes.
> Do they double it?
They pay whatever the work is worth to them.
> Do they pay zero? If they pay zero, what incentives workers to work at Macdonalds?
Not necessarily. You'd expect some inflation, but if the level of basic income was set at a low enough level (what that is depends on the overall productivity of the economy) it wouldn't be "continual" (well, if you exclude all other effects on price level but the basic income and its effect on price and the effect of that price change on wages, and the effect of those wage changes on price, etc., the effect might be "continual", but it would be asymptotically approaching a finite limit, so not unbounded, which is really where there would be a problem.)
> Also: How does Macdonalds work in this situation, if the fixed income "replaces" minimum wage. Does Macdonalds pay on top of this wage?
Yes.
> Do they double it?
They pay whatever the work is worth to them.
> Do they pay zero? If they pay zero, what incentives workers to work at Macdonalds?
Nothing, so they don't pay zero.