“…Social stigma is likely to give rise to a multiplicity of possible equilibria: when most people evade, the stigma effect is small and evasion is not in fact discouraged; when few evade, the stigma effect is great and evasion is discouraged. The transition from one equilibrium to the other takes the form of a 'noncompliance epidemic': if, for some reason, more people start to evade, the stigma decreases and evasion spreads to an ever larger fraction of the population (see Benjamini and Maital, 1985;Gordon, 1989, andMyles andNaylor, 1996). Alm and McCallin (1990), Landskroner, Paroush and Swary (1990), Yaniv (1990), and have extended Allingham and Sandmo with models in which taxpayers face more complex 'portfolio' set-ups offering other risky activities and alternative forms of evasion.…”