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This paper studies optimal earnings taxation in a three period life cycle model where the taxes raised to finance an exogenous amount of public expenditure are allowed to be differentiated across ages. Agents choose their level of education when young and their age of retirement when old. We first look at the problem of optimal taxation when the young can borrow and then turn to the case where young face borrowing constraints. It is shown that, without borrowing constraints, a first best optimum can be decentralized by setting a zero tax rate in the third period and a first period tax lower than the second one. With the borrowing constraint, the government may not be able restore intertemporal efficiency in which case a zero tax rate when old may not be optimal.

This paper studies optimal earnings taxation in a three period life cycle model where the taxes raised to finance an exogenous amount of public expenditure are allowed to be differentiated across ages. Agents choose their level of education when young and their age of retirement when old. We first look at the problem of optimal taxation when the young can borrow and then turn to the case where young face borrowing constraints. It is shown that, without borrowing constraints, a first best optimum can be decentralized by setting a zero tax rate in the third period and a first period tax lower than the second one. With the borrowing constraint, the government may not be able restore intertemporal efficiency in which case a zero tax rate when old may not be optimal.

This paper studies a market for a medical product in which there is perfect competition among health insurers, while the good is sold by a monopolist. Individuals di¤er in their severity of illness and there is ex post moral hazard. We consider two regimes : one in which insurers use coinsurance rates (ad valorem reimbursements) and one in which insurers use copayments (specic reimbursements). We show that the induced equilibrium with copayments involves a lower producer price and a higher level of wel- fare for consumers. This results provides strong support for a reference price based reimbursement policy.

A country consists of two non-overlapping regions, each ruled by a local authority. The federal government plans to construct a facility in one of the regions. If the facility is constructed, it generates a social value in the host region and has spillover effects in the rest of the country. The federal government does not observe the local value (which can be high or low) because it is in fact the local authority's private information. To deal with this informational gap, the federal government designs an incentive-compatible mechanism, specifying if the facility should be constructed and a scheme of interregional transfers. But the federal government is constitutionally constrained to respect a given measure of both regions' welfare. The type of local misbehaviour is shown to depend crucially upon this minimum utility the central government must at least implement.

A country consists of two non-overlapping regions, each ruled by a local authority. The federal government plans to construct a facility in one of the regions. If the facility is constructed, it generates a social value in the host region and has spillover effects in the rest of the country. The federal government does not observe the local value (which can be high or low) because it is in fact the local authority's private information. To deal with this informational gap, the federal government designs an incentive-compatible mechanism, specifying if the facility should be constructed and a scheme of interregional transfers. But the federal government is constitutionally constrained to respect a given measure of both regions' welfare. The type of local misbehaviour is shown to depend crucially upon this minimum utility the central government must at least implement.

We study the design of pension benets for male and female workers. Women live longer than men but have a lower wage. Individuals can be single or live in couples who pool their incomes. Social welfare is utilitarian but an increasing concave transformation of individuals lifetime utilities introduces the concern for redistribution between individuals with di¤erent life-spans. We derive the optimal direction of redistribution and show how it is a¤ected by a gender neutrality rule. With singles only, a simple utilitarian solution implies re- distribution from males to females. When the transformation is su¢ ciently concave redistribution may or may not be reversed. With couples only, the ranking of gender retirement ages is always reversed when the transformation is su¢ ciently concave. Under gender neutrality pension schemes must be self-selecting. With singles only this implies distortions of retirement decision and restricts redistribution across genders. With couples, a rst best that implies a lower retirement age for females can be implemented by a gender-neutral system. Otherwise, gender neutrality implies equal retirement ages and restricts the possibility to compensate the shorter-lived individuals. Calibrated simulations show that when singles and couples coexist, gender neutrality substantially limits redistribution in favor of single women and fully prevents redistribution in favor of male spouses.