This thesis consists of an introductory part and three papers. <p> Paper [I] examines how taxes affect consumption of commodities that are detrimental to health and the environment. Specifically, this paper examines if a tax increase leads to a significantly larger change in consumption than a...</p>

This paper concerns optimal taxation and environmental policy in the presence of transboundary environmental damage and labour market distortions, where the latter gives rise to wage bargaining externalities between countries. I consider a decentralized economic federation where the federal...

This paper concerns the optimal provision of a state-variable public good, where the global climate is the prime example. The analysis is based on a two-type optimal income tax model with overlapping generations, where people care about their relative consumption. We consider both...

We study how the optimal use of labor income tax progression depends on whether the wage bargaining system is decentralized or centralized. Assuming a nonlinear labor income tax and an unrestricted profit tax, we show that a Utilitarian government is able to implement the first best resource...

This paper analyzes optimal differential commodity taxation, together with optimal nonlinear income taxation, in order to deal with positional preferences. It also derives the optimal public provision of private goods both when differential commodity taxation is feasible and when it is not. It...

This paper deals with tax-policy responses to quasi-hyperbolic discounting. Earlier research on optimal paternalism typically abstracts from capital mobility. If capital is mobile between countries, it may no longer be possible for national governments to control domestic savings via capital...

During the latest decades, household mortgage loans have increased substantially in many countries. We develop an OLG model where housing is a positional consumption good (such that housing choices are partly driven by relative consumption concerns), and where the consumers are also...

This paper deals with optimal income taxation and relative consumption under a welfarist government that fully respects people’s preferences and a paternalist government that does not share the consumer preference for relative consumption. Consistent with previous findings, relative...

This paper analyzes whether marginal taxation of labor and capital income might be useful second best instruments for internalizing the externalities caused by conspicuous housing consumption, when the government is unable to implement a first best corrective tax on housing wealth. The rationale...

Previous studies on public policy under relative consumption concerns have ignored the role of leisure comparisons. This paper considers a two-type optimal nonlinear income tax model where people care both about their relative consumption and their relative leisure. Increased consumption...