Flypaper theory (economics)
The flypaper theory of tax incidence is a pejorative term used by economists to describe the assumption that the burden of a tax, like a fly on flypaper, sticks wherever it first lands. Economists point out several flaws with the assumption: it ignores the elasticity of goods; and it ignores the ability of producers to shift the cost of the tax onto consumers.
Source: Wikipedia — Flypaper theory (economics) (CC BY-SA 4.0)