Time-Varying Betas of German Stock Returns

The market model assumes stock returns to be a linear function of the market return. However, there is considerable evidence that the beta stability assumption commonly used when estimating the market model is invalid. In this paper we account for beta instability in German stock returns by allowing the coefficients to vary over time in estimation. For time-varying beta estimation we rely on the Flexible Least Squares approach, the Random Walk Model and Moving Window Least Squares. Due to our results time-varying estimation fits the data considerably better than time-invariant estimation and, hence, increases the efficiency of beta based risk measurement.Acknowledgements: The authors thank Stefan Mittnik, Christian Pigorsch, an anonymous referee and the editor for constructive comments.     

REFERENCE NORMS,STAGGERED WAGES,AND WAGE LEADERSHIP: THEORETICAL IMPLICATIONS AND EMPIRICAL EVIDENCE*

This article presents an extension of the Taylor model with staggered wages in which wage setting is also influenced by reference norms. We show that reference norms can considerably increase the persistence of inflation but that the size of this effect depends on the exact definition (e.g., external vs. internal, symmetric vs. asymmetric norms). Using data on collectively bargained wages in Austria from 1980 to 2006 we show that wage setting is strongly influenced by reference norms, that external norms seem to matter more than internal norms, and that there is a clear indication for the existence of wage leadership (asymmetric norms).     

Prices vs. Quantities with fiscal cushioning

Enforcement of international environmental quantity regulations (e.g. tradable pollution permits) is often expected to be stricter than that of price regulations (e.g. emission taxes). While both instruments provide opportunities for misrepresenting actual pollution, enforcement of international price-based instruments is additionally hampered by potential fiscal cushioning, i.e. an adjustment of domestic fiscal policies offsetting the tax incentive to reduce emission reductions. The present paper extends the formal debate on Prices vs. Quantities by including the risk of fiscal cushioning. We find the level of the marginal benefit curve and the variance of costs become key elements for instrument choice and can render quantity regulations strictly preferable. Remarkably, in the latter case, the slopes of the marginal curves do not affect optimal instrument choice. Numerical calculations, using data taken from the international climate policy context, support the potential dominance of quantity regulations found in our formal analysis.     

Noch tragbar? Versuch einer konsolidierten Erfassung der Eurorettungsrisiken

The overall risk to be borne by Germany in case of further bailouts financed through the EFSF and ESM remains an intriguing question. The German Constitutional Court??s preliminary ruling on 12 September 2012, capping Germany??s ESM risk exposure at ?190 billion, has not rendered further examination of the topic irrelevant. Indeed, Germany??s aggravated risk exposure bomb continues to tick, because EFSF funds have already been promised as guarantees for ailing states and they will continue to be used thusly. The article quantifies these risks, in addition to the Target II risk exposure, to confront the Constitutional Court with facts that it ?? consciously or unconsciously ?? ignored in its aforementioned ruling. If the Court had been more diligent or more open to financial expertise, the worst-case scenario of a near doubling of German public debt (from about ?2 trillion to ?3.7 trillion) makes it hard to understand how the Court could have considered such risk compatible with its own postulate of sustained fiscal democracy.     

Regime‐dependent smile‐adjusted delta hedging

We introduce several regime‐dependent smile‐adjusted deltas and compare their efficiency with the smile‐adjusted deltas that are popular with option traders. Using years of daily option prices, out‐of‐sample hedging performance tests for options of all moneyness and maturities and daily, weekly, or fortnightly rebalancing show that even the simplest regime‐dependent smile‐adjustment consistently outperforms implied BSM delta hedging and local volatility and minimum variance smile‐adjustments. Markov‐switching deltas offer the best performance, with delta‐hedging errors often half the size of implied BSM hedging errors. During volatile markets risk reduction from regime‐dependent delta hedging is much greater than during tranquil periods.     

Balancing Power Markets in Germany: Timing Matters

This paper analyzes timing issues on the German balancing power market. We focus the analysis on the length of the bidding period, i.e. the length of the time period a supplier has to provide balancing power capacities, and the question of how far before the beginning of a bidding period the auction should be carried out. We show that different load levels require different plants for the optimal provision of balancing power. In a longer bidding period, the power plants that have the lowest average cost in the bidding period are unlikely to be efficient in all hours of the bidding period. Hence, shortening bidding periods can increase efficiency. Furthermore, we show that an early commitment on a power plant’s mode of operation (when uncertainty about resulting spot prices is still relatively high) also reduces efficiency. This suggests that the auction should be held relatively close to the beginning of the bidding period. Furthermore, we discuss some advantages of a liquid real time market.     

Risk management,corporate governance,and bank performance in the financial crisis

The recent financial crisis has raised several questions with respect to the corporate governance of financial institutions. This paper investigates whether risk management-related corporate governance mechanisms, such as for example the presence of a chief risk officer (CRO) in a bank’s executive board and whether the CRO reports to the CEO or directly to the board of directors, are associated with a better bank performance during the financial crisis of 2007/2008. We measure bank performance by buy-and-hold returns and ROE and we control for standard corporate governance variables such as CEO ownership, board size, and board independence. Most importantly, our results indicate that banks, in which the CRO directly reports to the board of directors and not to the CEO (or other corporate entities), exhibit significantly higher (i.e., less negative) stock returns and ROE during the crisis. In contrast, standard corporate governance variables are mostly insignificantly or even negatively related to the banks’ performance during the crisis.     

Welfare-State Retrenchment: The Partisan Effect Revisited

This paper aims to shed light on the role of the ‘ideology’of political parties in shaping the evolution of the welfarestate in 18 developed democracies, by providing empirical findingson the determinants of social-programme entitlements and socialspending over the period 1981–99. The paper shows thatstructural change is a major determinant of the extent of socialprotection. Our results suggest that overall spending is drivenup by structural change. On the other hand, strong structuralchange has a negative influence on welfare entitlements measuredby the net rate of sickness insurance. Partisan influence playsan important role in the dynamics of the welfare state. Left-winggovernments strengthen the positive effect of shocks on aggregatesocial expenditure, while right-wing governments undertake evenstronger cutbacks in replacement rates as a reaction to structuralchange. Footnotes ¹ E-mail addresses: bruno.amable{at}ens.fr; donatella.gatti{at}cepremap.cnrs.fr;jan.schumacher{at}wiwi.uni-regensburg.de