Ideally, increases would get tied to the CPI, or some other index. I also wouldn't mind a provision that would automatically adjust payments to ensure solvency.

Regarding the amount, it should be small enough to make it difficult to live off of. I don't think it would be a good idea if we created a class of BI dependents. There should still be fairly strong incentives to work. I think the main purpose of the BI would be to alleviate the need to rely on corporate america as a de facto social welfare provider. If you look at what happened to Detroit, for example, after the car industry tanked, the local economy went down with it. At the very least, BI would have provided a stabilizing force, slowing down the decline, and possibly giving residents a chance to re-build the local economy.