Additional income is not additional willingness to pay 100% of that income forthe currently-purchased quality and quantity of one particular good or service, and even if it was that's a demand shift which without a supply change, will still result in a smaller increase in rent.
UBI, which any realistic method of implementing makes a shift in income from somewhere higher on the income spectrum to somewhere lower (the exact shift being defined by the UBI level and financing mechanism), most likely (if it replaces existing means tested welfare programs) most favoring a level somewhere above where current welfare programs start tapering off, does have some predictable price effects, but they aren't “all rents go up by an amount equal to the UBI amount times the number of recipients typically living in similar units”.
First order, they are some price increases across goods and services disproportionately demanded by the group benefitting in net, with some price decreases across those disproportionately demanded by the group paying in net. These will vary by elasticity, but in total should effect some (but less than total) compression of the time money shift, reducing somewhat the real cost to those paying and the real benefit to those receiving, but with less effect on those paying because of lower marginal propensity to spend with higher income.
Beyond first order is more complicated because you have to work through demand changes,and supply chnages caused by labor market changes from reduced economic coercion, increased labor market mobility and ability to retrain for more-preferred jobs, which are going to decreased supply for some jobs, increase supply for others (though on different schedules), etc.
UBI, which any realistic method of implementing makes a shift in income from somewhere higher on the income spectrum to somewhere lower (the exact shift being defined by the UBI level and financing mechanism), most likely (if it replaces existing means tested welfare programs) most favoring a level somewhere above where current welfare programs start tapering off, does have some predictable price effects, but they aren't “all rents go up by an amount equal to the UBI amount times the number of recipients typically living in similar units”.
First order, they are some price increases across goods and services disproportionately demanded by the group benefitting in net, with some price decreases across those disproportionately demanded by the group paying in net. These will vary by elasticity, but in total should effect some (but less than total) compression of the time money shift, reducing somewhat the real cost to those paying and the real benefit to those receiving, but with less effect on those paying because of lower marginal propensity to spend with higher income.
Beyond first order is more complicated because you have to work through demand changes,and supply chnages caused by labor market changes from reduced economic coercion, increased labor market mobility and ability to retrain for more-preferred jobs, which are going to decreased supply for some jobs, increase supply for others (though on different schedules), etc.