It is true, costs can vary from region to region. Land can be more expensive in urban areas. People in the regions say that land might not be more expensive, but other things are more expensive.
So the important thing is to have a rent target, because people's income is the same if they are receiving benefits, regardless of the region where they live. So we need to know what the costs and variations in costs are from region to region, as a function of various criteria.
So it is possible to adjust funding programs while taking into account certain realities. We sometimes create categories, recognizing the realities in urban areas and other realities in regional areas.
In closing, I think it is possible to adjust the subsidies by region, while still having a target, namely, rent that is within reach for the household.