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ABSTRACTCommodity tax structure affects the firm's choice between formality and informality. An increase in the specific tax rate, relative to an equivalent increase in ad valorem taxation, makes informality attractive to more firms. Formality becomes attractive at lower levels of profits under ad valorem taxation. For both the maximization of welfare subject to a revenue constraint and the unconstrained maximization of revenue, the optimal rate of specific taxation is zero.

Given heterogeneity in incomes and health risks, with asymmetric information in the latter, preferences over the public-private mix in health insurance and care are derived. Results concerning crowding-out in the presence of adverse selection are established. For low-risk individuals, crowding-out depends on risk aversion. A set of such individuals prefers a mixed public-private health care system. A majority-voting equilibrium exists. Under weak assumptions about the income distribution and tax function, both public and private sectors exist in the equilibrium. Comparing information regimes, public provision is more likely to be positive, and will not be lower, under asymmetric information. In the presence of asymmetric information, the equilibrium is more complicated than the "ends-against-the-middle" variety derived elsewhere in the literature.