With the current system, having enough political capital to raise/lower something means you can raise or lower it as much as you like. Yet this is not the case - a small raise in income tax, for example, would not be nearly as hard to achieve as doubling the rate. I therefore propose a sliding scale of political capital needs, where a greater change requires more capital. This would help make the game more realistic and interesting, by making drastic changes harder to implement.
Hmm good call. in real life it is much easier to pull off a minor change than a major one, however I think a “minimum charge” as it were should be applied just to get the level changed in the first place.