Understanding how banks react to unexpected events has become a very important economic and social question, especially since the financial crisis (Ivashina and Scharfstein, 2010; Puri et al., 2011). Whereas previous financial crises had largely stayed in the realm of finance, or very limited areas of the economy, the financial crisis of 2007-2008 demonstrated that unexpected financial shocks can have severe implications for the real economy in general, impacting the lives of a large cross-section of the population, for example through general reductions in employment (Chodorow- Reich, 2014; Popov and Rocholl, 2017). This new realization has led to an extensive literature on how banks react to unexpected events, especially if and how they transfer such shocks to firms and households. As a result, understanding exactly how shocks are transferred not only between banks (Popov and Udell, 2012; Schnabl, 2012), but also between banks and firms has become a crucial aspect of financial research (Peek and Rosengren, 2000; Gan, 2007; Ongena et al., 2015; Acharya et al., 2018; Gropp et al., 2018; Huber, 2018). It has returned into focus the idea that a functioning connection between banks and firms constitutes a crucial part of a well-functioning economy. This thesis aims to contribute to the understanding of how this bank-firm relationship functions and what pitfalls it might entail.

We isolate the direct bank-to-sovereign distress channel within the eurozone’s sovereign-bank-loop by exploiting the global, non-eurozone related variation in stock prices. We instrument banking sector stock returns in the eurozone with exposure-weighted stock market returns from non-eurozone countries and take further precautions to remove any eurozone crisis-related variation. We find that the transmission of instrumented bank distress, while economically relevant, is significantly smaller than the corresponding coefficient in the unadjusted OLS framework, confirming concerns on reverse causality and omitted variables in previous studies. Furthermore, we show that the spillover of bank distress is significantly stronger for countries with poorer macroeconomic performances, weaker financial sectors and financial regulation and during times of elevated political uncertainty.

Zehn Jahre nach der Lehman-Pleite werden die Finanzmärkte besser kontrolliert denn je. Das kann böse Folgen haben.

Since the global financial crisis, monetary economics new questions include the explanation and response to unusual consumer price developments but also the interdependencies between financial markets and real economic activity and its implication for the monetary policy transmission mechanism. This dissertation investigates these questions by presenting empirical evidence that accounts for non-linearities of the relevant economic relations. The first and second chapters examine inflation dynamics of the Euro area and ASEAN-5 economies using non-linear Phillips curve models. The results suggest that changes in inflation processes are mainly driven by the development of long-term inflation expectations. The third chapter investigates the evolution of the financial accelerator (FA) taking into account the developments of the financial sector. The results of a time-varying structural vector autoregressive model indicate that the FA effect for the USA has increased from the early 1990s.

• In summer 2018 the cyclical upswing of the world economy is not over, but it appears to be fragmenting. While economic activity in the European Union has lost steam, the upswing in the US has gained pace, and growth in China appears to be robust. • Markets for commodities as well as for capital are at present strongly affected by political movements: oil prices are more than 50% higher than one year ago, as the US exit from the Iran nuclear deal puts the long run oil supply from Iran at risk, and the strongly expansionary US tax reform explains the rise in US long run interest rates. . • Uncertainties about the future international trade system cause firms to slow down or even reverse the globalization of value chains. As an early consequence, world trade in the second half of 2018 and in 2019 will expand at much slower rates than during 2017. • In the euro area growth slowed in the first quarter 2018, due to weaker investment activity in France and Italy and, more importantly, a fall in exports in all larger euro area economies except Spain. However, the drivers of the upswing such as low interest rates for credit and expanding real incomes will still be supportive in the near future, and fiscal policies will be slighly more expansionary. But a slowdown in world trade will dent export growth as well as corporate profits. All in all, we expect GDP growth in the euro area to go down from 2.4% in 2017 to 2.1% in 2018 and to 1.7% in 2019 – a forecast that will only be realized if damages to the international trade system are limited and if the European sovereign debt crisis does not come back. • While wage inflation has been slowly increasing during the past quarters to about 2%, a clear upwards trend of core consumer price inflation is still not detectable. The recent jump of the headline rate to 1.9% is due to higher oil prices. Our forecasts for 2018 and 2019 are close, although still below, 2%.

Since the global financial crisis, economic literature has highlighted banks’ inclination to bolster up their liquid asset positions once the aggregate interbank funding market experiences a dry-up. To this regard, we show that liquidity hoarding and its detrimental effects on credit can also be triggered by idiosyncratic, i.e. bankspecific, interbank funding shocks with implications for monetary policy. Combining a unique data set of the Brazilian banking sector with a novel identification strategy enables us to overcome previous limitations for studying this phenomenon as a bankspecific event. This strategy further helps us to analyse how disruptions in the bank headquarters’ interbank market can lead to liquidity and lending adjustments at the regional bank branch level. From the perspective of the policy maker, understanding this market-to-market spillover effect is important as local bank branch markets are characterised by market concentration and relationship lending.

Reserve requirements, as a tool of macroprudential policy, have been increasingly employed since the outbreak of the great financial crisis. We conduct an analysis of the effect of reserve requirements in tranquil and crisis times on credit and GDP growth making use of Bayesian model averaging methods. In terms of credit growth, we can show that initial negative effects of higher reserve requirements (which are often reported in the literature) tend to be short-lived and turn positive in the longer run. In terms of GDP per capita growth, we find on average a negative but not robust effect of regulation in tranquil times, which is only partly offset by a positive but also not robust effect in crisis times.

• The world economy is booming. The global upswing is investment-driven, and since investment goods usually have a large import content, it is no surprise that world trade has been buoyant during winter. The very expansionary US fiscal policy (tax reform and lifting of spending caps) could give an additional shortterm stimulus for the world economy. • However, we forecast world trade to slow down during 2018. The US administration’s announcement of high tariffs on steel and aluminium comes close to triggering a spiral into a broader trade conflict. Moreover, the globalization of value chains has been slowing down since the financial crisis due to the industrial upgrading in China and in other emerging economies that has declined processing trade. In addition, some types of manufacturing jobs have returned to source countries (reshoring) in response to technology innovation and lower labour costs differentials. • The euro area is in the middle of a broad based cyclical upswing. Higher exports and improved expectations have induced firms to invest more into equipment, as capacity utilization has been above average for some time now and is still increasing, and financing costs are very low. However, recent soft indicators, but also industrial production have been surprisingly downbeat, and there was some turbulence in financial markets, which suggests some caution. • The ECB will probably stop its asset purchase program at the end of 2018, but only later in 2019 start raising interest rates. Fiscal policy in the euro area is slightly expansionary this year, and a notable fiscal stimulus in France and in Germany is to be expected for 2019. • Overall, we forecast euro area GDP to expand by 2.2% in 2018 and by 1.6% in 2019. Accelerating wage dynamics will, together with higher price setting powers of firms and the recent increase in oil prices, cause consumer price inflation rising to nearly to 2% in 2019. Uncertainty, is however substantial, as a slight slowdown cannot be ruled out, which would also impact inflation dynamics.

The adverse macroeconomic consequences of the Great Recession in 2009 spread well beyond the United States, highlighting the importance of financial stability and the housing market for real economic activity. Moreover, the vicious bank-sovereign cycle and the resulting sovereign-debt crisis of 2010-2012 posed a big threat to the survival of the Economic and Monetary Union (EMU) as a whole. While there is widespread consensus about the underlying causes of these crises, policy makers are still debating about what can be done to prevent future crises and, especially in the Euro area, deeply disagree on the direction of reforms. After all, most regulatory measures face not only the trade-off between financial resilience versus efficiency but also the fundamental choice between rule or discretion based interventions (Bénassy-Quéré et al., 2018).

Die Finanz- und Wirtschaftskrise 2008/2009 traf die deutsche Wirtschaft infolge ihrer beträchtlichen Abhängigkeit von den Weltmärkten besonders stark über den Außenhandelskanal. Der Aufsatz behandelt den Netto-Einfluss des Exportschocks auf die Wertschöpfung und Beschäftigung in Deutschland und wendet dazu die Input-Output-Analyse an.