While lichen planus very rarely leads to oral cancer, irritation of lichen planus by tobacco and alcohol, poorly fitting dentures, and poor oral hygiene can turn lichen planus into the erosive type.
In economics, a deadweight loss (also known as excess burden or allocative inefficiency) is a loss of economic efficiency that can occur when equilibrium for a good or service is not achieved or is not achievable.he deadweight loss is the area of the triangle formed by the grey tax income box (to the right of it), the original supply curve, and the demand curve.
It also refers to the deadweight loss created by a government's failure to intervene in a market with externalities. In the case of a government tax, the amount of the tax drives a wedge between what consumers pay and what producers receive, and the filled-in wedge shape is equivalent to the deadweight loss from the tax.