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How Flexible Electrification Can Integrate Fluctuating Renewables

To phase out fossil fuels, energy systems must shift to renewable electricity as the main source of primary energy. In this paper, we analyze how electrification can support the integration of fluctuating renewables, like wind and PV, and mitigate the need for storage and thermal backup plants. Using a cost-minimizing model for system planning, we find substantial benefits of electricity demand in ...

Ukrainian Refugees: Nearly Half Intend to Stay in Germany for the Longer Term

Millions of Ukrainians have been displaced by the Russian war on Ukraine, with over one million alone coming to Germany since the beginning of the war. Data from the second survey wave of the IAB-BiB/FReDA-BAMF-SOEP Survey of Ukrainian Refugees in Germany study show that as of the beginning of 2023, an increasing share of Ukrainian refugees plan on staying in Germany for the longer term. Around three ...

Diversify or Not? – The Link between Global Sourcing of ICT Goods and Firm Performance

Our paper contributes to the discussion about Europe’s digital sovereignty. We analyze the relationship between firm performance and the diversification of sourcing countries for imported ICT goods. The analysis is based on administrative data for 3888 German manufacturing firms that imported ICT goods in the years 2010 and 2014. We find that firms that diversify the sourcing of ICT goods across multiple ...

Combining GPS Tracking and Surveys for a Mode Choice Model: Processing Data from a Quasi-Natural Experiment in Germany

This paper deals with the data generation process implemented for an analysis of the impact of the 9-Euro ticket on mode choice. We discuss the assumptions made and procedures used to process a raw dataset that is based on GPS traces of individuals’ movements and on survey data into the choice-set for a discrete choice model. Several steps of cleaning and merging are described in order to a) obtain ...

Working Life and Human Capital Investment: Causal Evidence from a Pension Reform

Estimating Mode Choice Inertia and Price Elasticities after a Price Intervention – Evidence from Three Months of almost Fare-free Public Transport in Germany

This study analyses the behavioural response of travellers on a temporal reduction of public transport prices in Germany through the so-called 9 Euro Ticket during summer 2022. The focus is on the inertia effect, e.g. the resistance to change behaviour, on people's travel mode decisions for commuter trips. We estimate mixed logit models for nearly 7,000 commuter trips, based on GPS-tracking data collected ...

Collaborative Investor Engagement with Policymakers: Changing the Rules of the Game?

Applying universal ownership theory and drawing on multiple-case studies, this article analyzes what drives institutional investors to engage with government entities and what challenges they find in the process. We relied on document analysis and conducted twelve semi-structured interviews with representatives from asset owners, asset managers, investor associations, and academia. We identify a trend ...

Does Your Smartphone “Know” Your Social Life? A Methodological Comparison of Day Reconstruction, Experience Sampling, and Mobile Sensing

Mobile sensing is a promising method that allows researchers to directly observe human social behavior in daily life using people's mobile phones. To date, limited knowledge exists on how well mobile sensing can assess the quantity and quality of social interactions. We therefore examined the agreement among experience sampling, day reconstruction, and mobile sensing in the assessment of multiple aspects ...

Causal Misperceptions of the Part-time Pay Gap

In this paper, we analyze if an increase in the working life leads to more human capital investment via on-the-job training. We obtain RDD-estimates from a sharp date-of-birth cut-off, generated by a pension reform that increased the Early Retirement Age (ERA) by three years for many women in Germany. In our preferred specification, we find that this reform causally increased on-the-job training by ...

The effect of pension reforms on old age poverty

This project analyses various reform and labour market scenarios with regard to their impact on old-age poverty in the period up to 2045. These are changes to the lower limit for the level of protection in the GRV (holding lines), the pension adjustment rule, a higher retirement age, a generous exemption scheme for pension income from the GRV for basic security, and increased gainful employment at...