Structural Interpretation of Vector Autoregressions with Incomplete Identification: Revisiting the Role of Oil Supply and Demand Shocks
Christiane Baumeister, James D. Hamilton
American Economic Review,
Nr. 5,
2019
Abstract
Traditional approaches to structural vector autoregressions (VARs) can be viewed as special cases of Bayesian inference arising from very strong prior beliefs. These methods can be generalized with a less restrictive formulation that incorporates uncertainty about the identifying assumptions themselves. We use this approach to revisit the importance of shocks to oil supply and demand. Supply disruptions turn out to be a bigger factor in historical oil price movements and inventory accumulation a smaller factor than implied by earlier estimates. Supply shocks lead to a reduction in global economic activity after a significant lag, whereas shocks to oil demand do not.
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Inference in Structural Vector Autoregressions when the Identifying Assumptions are not Fully Believed: Re-evaluating the Role of Monetary Policy in Economic Fluctuations
Christiane Baumeister, James D. Hamilton
Journal of Monetary Economics,
2018
Abstract
Point estimates and error bands for SVARs that are set identified are only justified if the researcher is persuaded that some parameter values are a priori more plausible than others. When such prior information exists, traditional approaches can be generalized to allow for doubts about the identifying assumptions. We use information about both structural coefficients and impacts of shocks and propose a new asymmetric t-distribution for incorporating information about signs in a nondogmatic way. We apply these methods to a three-variable macroeconomic model and conclude that monetary policy shocks are not the major driver of output, inflation, or interest rates.
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Tail-risk Protection Trading Strategies
Natalie Packham, Jochen Papenbrock, Peter Schwendner, Fabian Wöbbeking
Quantitative Finance,
Nr. 5,
2017
Abstract
Starting from well-known empirical stylized facts of financial time series, we develop dynamic portfolio protection trading strategies based on econometric methods. As a criterion for riskiness, we consider the evolution of the value-at-risk spread from a GARCH model with normal innovations relative to a GARCH model with generalized innovations. These generalized innovations may for example follow a Student t, a generalized hyperbolic, an alpha-stable or a Generalized Pareto distribution (GPD). Our results indicate that the GPD distribution provides the strongest signals for avoiding tail risks. This is not surprising as the GPD distribution arises as a limit of tail behaviour in extreme value theory and therefore is especially suited to deal with tail risks. Out-of-sample backtests on 11 years of DAX futures data, indicate that the dynamic tail-risk protection strategy effectively reduces the tail risk while outperforming traditional portfolio protection strategies. The results are further validated by calculating the statistical significance of the results obtained using bootstrap methods. A number of robustness tests including application to other assets further underline the effectiveness of the strategy. Finally, by empirically testing for second-order stochastic dominance, we find that risk averse investors would be willing to pay a positive premium to move from a static buy-and-hold investment in the DAX future to the tail-risk protection strategy.
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A note on GMM-estimation of probit models with endogenous regressors
Joachim Wilde
IWH Discussion Papers,
Nr. 4,
2005
Abstract
Dagenais (1999) and Lucchetti (2002) have demonstrated that the naive GMM estimator of Grogger (1990) for the probit model with an endogenous regressor is not consistent. This paper completes their discussion by explaining the reason for the inconsistency and presenting a natural solution. Furthermore, the resulting GMM estimator is analyzed in a Monte-Carlo simulation and compared with alternative estimators.
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Analysis of Statements Made in Favour of and against the Adoption of Competition Law in Developing and Transition Economies
Franz Kronthaler, Johannes Stephan, Frank Emmert
IWH-Sonderhefte,
Nr. 1,
2005
Abstract
The paper is concerned with documenting and assessing statements made by policy-makers, opinion formers, and other stakeholders in favour and against the adoption of competition laws with particular reference to transition and developing countries which have not yet enacted these kind of laws. For example, claims that competition enforcement might reduce the inflow of foreign direct investment, or that other policies are successfully used as substitutes for competition law, are assessed. In a first step, the method of generalized analysis structures the list of statements around core issues of common features to make them accessible to further interpretation and assessment.
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Analysis of statements made in favour of and against the adoption of competition law in developing and transition economies
Johannes Stephan, Franz Kronthaler, Frank Emmert
Einzelveröffentlichungen,
Nr. 9,
2005
Abstract
The paper is concerned with documenting and assessing statements made by policymakers, opinion formers, and other stakeholders in favour and against the adoption of competition laws with particular reference to transition and developing countries which have not yet enacted these kind of laws. For example, claims that competition enforcement might reduce the inflow of foreign direct investment, or that other policies are successfully used as substitutes for competition law, are assessed. In a first step, the method of generalized analysis structures the list of statements around core issues of common features to make them accessible to further interpretation and assessment. The paper shows that some claims are in fact country or region specific, and specific to the development level of the respective countries. In a second step, the core issues are assessed according to economic and legal criteria. Since the analysis focuses on transition and developing countries, the criteria for economic assessment are predominantly economic growth and development issues, but also include the economic coherency of a set of claims submitted by stakeholders in a given country. The criteria for legal assessment include whether claims are problematic in light of WTO-principles, or are even born out of a political objective which is incompatible with the spirit, if not the letter of WTO-rules.
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