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We study social norms of intervention behavior. Specifically, we study in different decision contexts i) if respondents believe that one should restrict the choice set of other people, and ii) if respondents correctly guess the share of respondents who believe that one should restrict others' choice sets.

We study the extent of automation angst and its role for policy preferences, labor market choices and real donation decisions using a customized survey in Germany and the US. We first document that a majority perceives automation as a major threat to overall employment and as a cause of rising inequality, whereas less than a third is concerned about their own labor-market prospects. We find evidence that automation angst is strongly associated with people's trust in governments and general political beliefs, especially in the US. At the same time, automation angst is associated with preferences for more policy interventions and also relates to stated and actual behavior. Using randomized survey experiments, we find that scientific information about zero net employment effects of automation, on average, reduce related concerns. Yet, treatment responses are multidimensional and depend on prior beliefs about the future or work. This translates into heterogeneous and sometimes even opposing effects on policy preferences and individual behavior.

We exploit a large reform of capital-gains taxation in Germany combined with portfolio-level daily panel data to study the causal effect of taxes on individual stock-trading behavior and the disposition effect. We find substantial spikes in selling probabilities around an intertemporal tax discontinuity, and no such spikes after the abolishment of the discontinuity. Using difference-in-bunching methods, non-parametric regressions and effective tax rates, we quantify the tax effect and identify interesting patterns of heterogeneity. We further find evidence that the well-established disposition effect is strongly affected by the tax discontinuity through tax motivated selling of both gains and losses.

How do firms' avoidance and evasion opportunities affect market prices? We investigate the causal link between tax-evasion opportunities and prices in a situation where firms remit sales taxes and have access to tax-evasion possibilities. In light of difficult causal identification with observational data, we design a controlled experiment in which buyers and sellers trade a fictitious good in competitive markets. A per-unit tax is imposed on sellers, and sellers in the treatment group are provided the opportunity to evade the tax whereas sellers in the control group are not. We find that the equilibrium market price in the treatment group is lower than in the control group, and the number of traded units is higher in treatment markets. The results further show that the after-tax incomes of sellers increase through the evasion opportunity despite the lower prices. Our findings have implications for tax incidence. We show that sellers with access to evasion shift a smaller share of the nominal tax rate onto buyers relative to sellers without tax evasion opportunities. In addition, we find that sellers with evasion opportunities shift the full amount of their effective tax rate onto buyers. Additional experimental treatments show that this full shifting of the effective tax burden is due to the evasion opportunity itself rather than the evasion-induced lower effective tax rate.

Using new survey and experimental data for a representative sample of the German population, we study preferences for tax simplification. The general wisdom seems to suggest that most tax systems are overly complex and that tax simplification is generally desirable. Consistent with this general wisdom, we find that more than 90% of our sample believe that the tax system needs to be simplified. However, there also are efficiency and equity arguments in support of a certain degree of tax complexity and it is puzzling why tax systems remain highly complex despite the conventional view in favor of more simplification. The main purpose of our study then is to investigate if the high support for tax simplification is driven by a lack of awareness about the trade-offs behind simple and complex tax systems. Our data show that the support for simplification decreases as we randomly provide economic arguments against simplification and as we ask respondents if the tax system should account for specific differences in living situations (such as costly care of elderly family members). Overall, our findings suggest that the high support for simpler taxes is to some extent driven by a lack of awareness about the implications of tax simplification.

German municipalities have substantial autonomy in setting taxes on two distinct tax bases: business profits and property values. We use this setting and a two-step approach to explore whether implemented tax policy is consistent with the seminal inverse-elasticity rule. First, we estimate the tax elasticity of the two tax bases using event-study and generalized differences-in-differences methods based on the universe of municipalities in 1995-2010. Second, we compare the ratio of the observed tax rates for the two tax bases to the ratio of their estimated elasticities. We find that property is not very responsive to variation in tax rates, whereas business profits respond significantly. While this would suggest that property should be taxed at a higher rate, the data show that this not the case: most municipalities impose relatively higher rates on business profits. This suggests that municipality-level taxation in Germany is inconsistent with the inverse-elasticity rule. We provide suggestive evidence that this finding is explained by politician's imprecise expectations about revenue elasticities as well as re-election concerns.

We present the first randomized survey experiment in the context of tax compliance to assess the role of social norms and reciprocity for intrinsic tax morale. We find that participants in a social-norm treatment have lower tax morale relative to a control group while participants in a reciprocity treatment have significantly higher tax morale than those in the social-norm group. This suggests that a potential backfire effect of social norms is outweighed if the consequences of violating the social norm are made salient. We further document the anatomy of intrinsic motivations for tax compliance and present first evidence that previously found gender effects in tax morale are not driven by differences in risk preferences.

The standard labor-supply literature typically assumes that the labor supply response to wage increases is the same as that for equivalent wage decreases. However, evidence from the behavioral-economics literature suggests that people are loss averse and thus perceive losses differently than gains. This behavioral insight may imply that workers respond differently to wage increases than to wage decreases. We estimate the effect of wage increases and decreases on labor supply using a randomized field experiment with workers on Amazon's Mechanical Turk. The results provide evidence that wage increases have smaller effects than wage decreases, suggesting that the labor-supply response to wage changes is asymmetric. This finding is especially strong on the extensive margin where the elasticity for a wage decrease is twice that for a wage increase. These findings suggest that a reference-dependent utility function that incorporates loss aversion is the most appropriate way to model labor supply.

We study the effect of inflowing remittances - a major source of capital for many countries - on tax-revenues and tax-policy. Instrumenting remittances with changes in the oil-price interacted with a country's distance to oil-producing countries, we find that remittances have a large positive effect on VAT revenues but no effect on income-tax revenues. This suggests that remittances often escape the income tax but can be taxed via consumption. We further show that tax policy is responsive to shocks in incoming remittances: remittances make the adoption of VAT-systems more likely, and they lead to lower VAT-rates and higher income-tax rates.

We study tax compliance in Slovenia using data generated in a field experiment. Small accounting companies were randomly assigned to an untreated control group and two treatment groups. Companies in the first treatment group received a letter that highlighted the importance of paying taxes and informed about the likelihood of becoming subject to an audit. In the second treatment group, tax officers from the tax authorities handed out in person the same letter that companies in the first treatment group received by post. The results indicate that such letters can increase compliance, and trigger even more compliance if handed over in person. These findings are in line with the theoretical predictions that we derive to rationalize the experiment.

Several recent studies show that the elasticity of taxable income (ETI) is not a sufficient statistic for the welfare costs of taxation due to factors such as taxbase shifting. This paper provides an additional argument demonstrating the non-sufficiency of the ETI, namely tax deductions. Building on a theoretical framework which incorporates deductions in a standard optimal-tax model, we show that the ETI is not sufficient for welfare analysis if (i) deductions generate externalities and if (ii) deductions are responsive to tax-rate changes. While the first condition should arguably hold true for the majority of tax deductions, we provide an empirical examination of the second condition. Relying on rich German panel data from administrative tax records, we exploit several tax reforms that were implemented in Germany between 2001 and 2008. Our main estimates indicate an overall ETI between 0.35 and 0.68 and an elasticity of deductions with respect to the net-of-tax rate between -0.3 and -0.9. These results suggest that the ETI is not sufficient to calculate the welfare cost of taxation.

This dissertation consists of four self-contained papers on tax compliance. The methodological approach is mainly empirical.

The elasticity of taxable income (ETI) is often interpreted as a sufficient statistic to assess the welfare costs of taxation. Building on the conceptual framework of Chetty (2009), we show that this assertion does no longer hold for tax systems with deduction possibilities if (i) deductions generate externalities and (ii) deductions are responsive to tax rate changes. While the first condition should arguably hold for almost any imaginable tax deduction, we provide a thorough empirical examination of the second condition. Relying on rich German panel data from administrative tax records, we exploit several tax reforms that were implemented in Germany between 2001 and 2008. Our baseline estimates indicate an overall ETI of 0.49 and an elasticity of deductions with respect to the net-of-tax rate of -2.80. Given that the majority of deductions in the German income tax system generate externalities, our non-zero deduction elasticity suggests that the ETI is not sufficient to calculate the welfare cost of taxation.

This paper studies the effect of tax evasion on the economic incidence of sales taxes. We design a laboratory experiment in which buyers and sellers trade a fictitious good in double auction markets. A per-unit tax is imposed on sellers, and sellers in the treatment group are provided the opportunity to evade the tax whereas sellers in the control group are not. We find that the market equilibrium price in the treatment group is economically and statistically lower than in the control group. This result is consistent with a theoretical model in which access to evasion opportunities reduces the effective tax rate and therefore dampens real behavioral responses. Our findings suggest that the benefits of tax evasion are not limited to the side of the market with access to evasion but are partly shifted to the non-evading side of the market. We discuss the implications of our findings for the distributional and welfare effects of taxes.

Recent discussions about rising inequality in industrialized countries have triggered calls for more government intervention and redistribution. Due to obvious behavioral effects caused by redistribution, it is however not clear whether redistributional policies are indeed able to combat inequality. This paper contributes to this relevant research question by using different contextual country-level data sources to study inequality trends in OECD countries since the 1980s. We first investigate the development of inequality over time before analyzing the question of whether governments can effectively reduce inequality. Different identification strategies, using fixed effects and instrumental variables models, provide some evidence that governments are capable of reducing income inequality despite countervailing behavioral adjustments. The effect is stronger for social expenditure policies than for progressive taxation, which seems to trigger more inequality increasing indirect behavioral effects. Our results also suggest that the use of secondary inequality data should be handled with caution.

This paper provides evidence of efficient taxation of groups with heterogeneous levels of tax morale. We set up an optimal income tax model where high tax morale implies a high subjective cost of evading taxes. The model predicts that nice guys finish last: groups with higher tax morale will be taxed more heavily, simply because taxing them is less costly. Based on unique cross-country micro data and an IV approach to rule out reverse causality, we find empirical support for this hypothesis. Income groups with high tax morale systematically face higher average and marginal tax rates. To the best of our knowledge, this is the first paper to investigate whether differences in tax morale affect the distribution of the tax burden across different groups of taxpayers.

As the link between tax compliance and tax morale is found to be robust, finding the determinants of tax morale can help to understand and fight tax evasion. In this paper we analyze the effect of progressive taxation on tax morale in a cross-country approach - which has not been investigated before. Our theoretical analysis leads to two testable predictions. First, an individual's tax morale is higher, the more progressive the tax schedule is. Second, the impact of tax progressivity on tax morale is declining in income. In our empirical analysis, we make use of a unique dataset of tax progressivity measures and follow most of the tax morale literature by employing the World Values Survey to measure tax morale. Controlling for a wide range of variables, we confirm both hypotheses in our empirical analysis.