Still, it may make sense to start with policies based on the efficient - market concept (tax / credit), which should tend to have a
desired effect (while markets are imperfect, it's not like they're worse than randomness; perhaps the efficient market concept is a little bit like the quasi-geostrophic approximation applied to midlatitude synoptic scale systems —
intense cyclones (large Ro) will require corrections, but it's a good place to start.).