Here are research topics for Master- and Diplomatheses. In principle, all topics covered in lectures or seminars of the chair can be elaborated on in theses.
More specifically, here are some suggestions.
The redistribution of GDP
Total output of an economy is divided among its inhabitants through a variety of mechanisms. They include redistribution via the state (pension, social security payments, public education) and redistribution via the market, i.e. via factor rewards for factors of production, typically labour and capital. While this is theoretically easy to understand, understanding the actual numbers is more involved. Who receives which share of total output (i.e. GDP) of a country in Germany (or any other country of interest)? While a classic share has been widely documented, the share of labour income in GDP, computing this share is very interesting. What is the role of inflation and how is inflation computed or which price index should be used are just three of the questions involved. Once the share of GDP going to labour is understood, the next question would be how total labour income can be split into hours worked and factor rewards per hour. Having done this would bridge the gap between the well-known stagnant real-wage index (e.g. for Germany) and the increase in GDP. Does total labour income increase only because people work more and more at constant real wages? Or do workers also profit from the increase in total factor productivity via rising wages. These are some of the questions a master thesis can answer.
Why is Germany the Export World Champion?
Germany is known for its trade balance surplus. Almost ever since there is reliable data and for most years, Germany's value of exports exceeds the value of imports. When relating the export surplus to GDP, Germany has the highest export ratio among G7 but also among European countries in most of the recent years. This makes Germany a world champion in exporting.
Why does Germany export so much? Economic theory provides many potential answers to this question. Which of these answers are relevant for Germany and which are the most important channels quantitatively speaking? The thesis will start by describing the phenomenon of export surpluses empirically and by comparing surpluses among G7 and European countries. The main objective consists in quantifying the importance of the various channels in order to understand the reasons why Germany exports so much. If time and space permits, the thesis could also study whether any policy implications can be drawn from these findings.
Principal-Agent models and the effort-reward-imbalance view
There is overwhelming empirical evidence from organizational and work psychology that the structure of work relationships and the role of the superior is crucial for well-being of workers. The appropriate theoretical framework to understand this would be the principal-agent model well-known in microeconomics. Students who like to bridge gaps are welcome to look at both of these prominent literatures and to see how findings in one can inform theory building in the other and how theory building can help understand empirical regularities better.
Why do women earn less than men? Facts, theories and explanations
It is a well-known stylized fact that women earn less than men. How strong this effect is depends on the exact econometric model under consideration. There are two leading theories that can help understand the gender-gap: preference-driven discrimination and statistical discrimination. This thesis looks at how well theories and empirical regularities fit and whether some deeper answers than gender gap can be given.
Unemployment in developing countries
The literature on employment and unemployment for high-income countries is relatively well developed. Search and matching models in the tradition of Diamond, Mortensen and Pissarides provide excellent theoretical frameworks to study data and understand the effects of business cycles, policy and other on the dynamics of unemployment. But what about low- and medium-income countries? If the big difference between the two groups consists in the existence or in the size of an informal sector, then one would like to understand not only how the unemployment rate evolves over time, but also, inter alia, what the determinants of the size of the informal sector is.
The objective of the Master thesis consists in finding out what these determinants are. A literature survey on theoretical and empirical work would be the starting point. Relevant references include Albrecht, Navarro and Vroman (2009), Ulyssea (2010), Meghir, Narita and Robin (2015) and Satchi and Temple (2009). Later, the thesis can continue by further developing theoretical models or undertaking independent empirical work.
Media Violence and Real World Violence
There is evidence that exposure to violence in media (TV, movies, video games) is strongly linked to increases in aggression (Bushman and Anderson, 2001, 2002). At the same time, these facts have been debated (Anderson and Bushman, 2002) and the evidence is contested (Block and Crain, 2007). See also the reply by Bushman and Anderson (2007). This evidence is mainly based on data from the USA.
The objective of this Master thesis is to revisit the existing facts and to provide an overview of comparable data and studies for Europe and Germany. A distinction between public ("öffentlich-rechtlich") and private media would be of high interest.
Behavioural macro is not yet as fully developed as one might wish. While there are many behavioural economics analyses, very few of them are embedded in a macro setup. The objective of theses in this area would consist in looking at behavioural models presented in various seminars and lectures (think of Macro II or Advanced Macro) and understand the effects of these broader views of human behaviour on economic growth, business cycles, unemployment or other. To make an example, how do cues or addiction influence savings behaviour and thereby growth or the reaction to business cycle shocks? Other topics that are related to psychology or behavioural economics and that can fruitfully be used for macro analyses are also welcome.
Economic theory of crime suggests that the decision to become criminal is a standard rational choice. Potential criminals compare expected utility from a criminal act to expected utility from not committing it. Depending on which value is higher, a criminal act will be observed or not. Now imagine society observes that there are "too many" criminal acts. (Or world society observes that there is too much aggression.) What is the optimal reaction? Increase punishment, increase the likelihood of being caught or improve outside options of criminals? As an example of the latter, imagine criminal behaviour depends on income inequality. To what extent should society (or its government) try to reduce income inequality and to what extent should punishment be increased? Going further and taking psychological determinants of a "criminal career" into account, how would optimal crime prevention programmes look like?
The background for this work is the survey available at www.worldvaluessurvey.org/. Students should like working with large datasets and should be interested in understanding why individuals that grew up in a continental European country are different from individuals that grew up in an anglo-saxon country. Regression analysis should be used to investigate the explanatory power of these differences. Some more general background is provided by Alberto Alesina and Paola Giuliano (2015) Culture and Institutions, Journal of Economic Literature, Vol. 53, Issue 4.
Labour market research
This work would be based on analyses undertaken by Andrey Launov, Klaus Wälde and others. See www.waelde.com -> publications for details. A strong interest (not necessarily experience) in theory, estimation and programming (in matlab) is an advantage. Access to a "fast" server will be provided by σοφια.
Emotions and happiness in marriage
Happiness is an important emotion. Being happy about one's relationship could be argued to be the most precious gift one can receive in life. It therefore seems sad that some argue (e.g. Laningham, Johnson and Amato, 2001) that happiness about one's marriage gradually falls over time. For romantic or not so romantic students interested in marriage and happiness from an empirical perspective, it might be of interest to know that the dataset for this paper is public and that there is a new wave available since this article appeared. The objective of this thesis would consist in (re-)evaluating the evidence concerning the existence of a negative duration effect.
Bilateral discussions and negotiations take place daily if not hourly in everyone's life. How does the economic literature on bargaining model these negotiations? An overview of cooperative and non-cooperative approaches to bargaining should be given before extensions are taken into account. This is a topic suitable for an individual that likes models and modelbuilding. More details on potential extensions will be provided to interested students in person.
Financial and real wealth
Whenever central banks publish numbers on financial wealth for a given country, they can be sure to receive a lot of public attention. "Financial wealth as high as never before" is one of the standard headings in newspapers. But what does financial wealth mean? Where does it come from? National accounting and standard economic reasoning would suggest that any increase in financial wealth (of one economic entity) goes hand in hand with an increase in debt (of another economic entity). If we then look at a country like Germany, Japan or Brasil (or any other country you might be interested in), what do these numbers of rising financial wealth mean? The thesis will start out by describing these numbers and continues by developing a theoretical model which allows studying the determinants of the evolution of financial wealth. It would conclude with a welfare analysis to come up with answers to the above questions.
The unemployment paradox
Recent research in economics (Launov and Wälde, 2013 and especially 2015 has identified the so-called 'unemployment paradox'. It says that a rise in productivity of the public employment agency in helping unemployed workers find a job can actually increase the unemployment rate. This effect is not only a theoretical finding but was shown to be empirically relevant for Germany following the Hartz III reform.
The objective of this master thesis would consist in identifying and presenting the essential mechanism behind this paradox in the simplest possible theoretical framework. The latter would focus on one individual only and the measure of unemployment would be replaced by average duration in unemployment. Bayesian learning would also be absent. Knowledge of matlab or willingness to learn matlab would be essential. Guidance is provided and a huge learning potential for the student is certain.