Raising PIP levels raises revenue

[MaxGhenis]

https://twitter.com/blazey2004/status/1741530294455292002

Still exists

[MaxGhenis]

Just bringing this back up. We show in the parameter page that it doesn't affect simulations, yet it does.

It doesn't seem to be just random noise for any null policy; e.g. changing the carbon tax household incidence without introducing a rate (correctly) has no effect.