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.
About 35 percent of welfare recipients have either major depression, post traumatic stress disorder, general anxiety disorder, alcohol dependence or drug dependence (Center for Poverty, Risk and Mental Health, University of Michigan, 1998).  Poverty is linked to poorer mental health (Adler et al., 1994).  People in the lowest strata of income, education, and occupation are about two to three times more likely than those in the highest strata to have a mental disorder (Holzer et al., 1986; Regier et al., 1993; Muntaner et al., 1998).