Time magazine has a person of the year; the Center for New Revenue is inaugurating a tax of the year. For 2020, it’s New Jersey’s new marijuana tax, which goes up as prices go down, stabilizing after-tax prices – a good idea, because pre-tax prices vary widely in the early years of legalization, and the legal market gets a tax break as bootleggers get marginalized during the roll-out of product in the early days of low supply and high demand .
Details about the tax are here: https://newrevenue.org/2020/12/18/new-jerseys-ground-breaking-marijuana-tax/. An unfortunate detail is that the new law has not been signed yet.