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 depends on the subject you're dealing with: taxes or subsidies. Either way, deadweight loss measures the loss of efficiency in a market. That happens because of the government revenue (or expenditure, in the case of subsidy) as well as the difference between the price paid by consumers and the price actually received by the producers.