https://refubium.fu-berlin.de/handle/fub188/23764 2026-04-28T03:49:05Z 2026-04-28T03:49:05Z Wickboldt, Clemens https://refubium.fu-berlin.de/handle/fub188/24484.2 2019-12-11T18:12:28Z 2019-01-01T00:00:00Z

Benchmarking a Blockchain-based Certification Storage System Wickboldt, Clemens A comprehensive empirical study is performed to measure the performance of a Blockchain-based Certi cation Storage System in Hyperledger Fabric. This work is based on a proof of concept in the aviation industry and fol- lows a Technical Risk & E cacy evaluation strategy to determine the utility derived from the use of the artefact. Relevant tuning parameters for per- formance and scalability as well as bottlenecks are identi ed. The impact of con guration parameters such as blocksize, transaction arrival rate and number of concurrent users on the systems performance is investigated. Ob- servations show that demands at throughput above system limits lead to transaction failures. Contributed are a repeatable process to performance sensitivity analysis and recommendations for con guring a Blockchain-based Certi cation Storage System for stable but high performance. The results can be used as a basis for optimizing the performance of similar systems.

2019-01-01T00:00:00Z Adam, Marc Christopher Jansson, Walter https://refubium.fu-berlin.de/handle/fub188/25248 2024-09-27T12:51:30Z 2019-01-01T00:00:00Z

Credit constraints and the propagation of the Great Depression in Germany Adam, Marc Christopher; Jansson, Walter We evaluate the role played by loan supply shocks in the decline of investment and industrial production during the Great Depression in Germany from 1927 to 1932. We identify loan supply shocks in the context of a time varying parameter vector autoregression with stochastic volatility. Our results indicate that credit constraints were a significant driver of industrial production between 1927 and 1932, supporting the view that a structurally weak banking sector was an important contributor to the German Great Depression. We find further that loan supply shocks were an important driver of investment in the early phase of the depression, between 1927 and 1929, but not between 1930 and 1932. We suggest possible explanations for this puzzle and directions for future research.

2019-01-01T00:00:00Z Strohsal, Till Wolf, Elias https://refubium.fu-berlin.de/handle/fub188/25147 2019-09-09T12:10:05Z 2019-01-01T00:00:00Z

Data revisions to German national accounts Strohsal, Till; Wolf, Elias Data revisions to national accounts pose a serious challenge to policy decision making. Well-behaved revisions should be unbiased, small and unpredictable. This paper shows that revisions to German national accounts are biased, large and predictable. Moreover, using filtering techniques designed to process data subject to revisions, the real-time forecasting performance of initial releases can be increased by up to 17%. For total real GDP growth, however, the initial release is an optimal forecast. Yet, given the results for disaggregated variables, the averaging-out of biases and inefficiencies at the aggregate GDP level appears to be good luck rather than good forecasting.

2019-01-01T00:00:00Z Márquez-Velázquez, Alejandro https://refubium.fu-berlin.de/handle/fub188/25601 2019-09-20T01:08:43Z 2019-01-01T00:00:00Z

Developing countries’ political cycles and the resource curse Márquez-Velázquez, Alejandro The resource curse literature’s main lesson is that developing and natural resourcerich countries should save most of their oil windfalls in foreign currency. Moreover, the political cycle literature’s recent contributions predict stronger cycles in these countries. This paper investigates how political cycles might explain low oil windfall savings. Using Venezuela’s case, the paper argues that power concentration during periods of oil price explosiveness leads to increased public investment in prestige projects aimed at increasing the incumbent’s – or his party’s – re-election probabilities. The article backs the argument analyzing the Chavista democratic period of 1999- 2016. It also identifies parallels with Venezuela’s 1970-1988 period.

2019-01-01T00:00:00Z