Publications & Work in progress

My research interests are digital economics and consumer privacy and more broadly economic consequences of policies. Nevertheless, I do not hesitate to cross scientific borders to conduct research on timely topics such as analyzing mitigation strategies of COVID-19 via econometric models.

Digital Economics

My current research focuses on investigating the richness and accuracy of third-party data on the internet as well as the implications of such data on the value of targeting. Using a unique and rich data base, I apply statistical models to infer the accuracy of consumer profiles without access to ground-truth data, or structural models to estimate the bounds of the accuracy and profitability of third-party data from the advertisers’ perspective. I also adapt analytical models from rational inattention theory into the context of targeted advertising to analyze the rationale behind the provision of such data from the publishers’ perspective.

Kraft, L., Miller, K. & Skiera, B. “How Much Do Data Providers Really Know About Consumers? Assessing the Richness and Accuracy of Third-Party Online Consumer Profiles. Under 1st round of review in Marketing Science.

Kraft, L. “Price of Privacy – Direct and Indirect Costs of Inaccuracies in Targeted Advertising”. Work in progress.

Kraft, L. “Less is More – When should Publishers Conceal Consumer Data from Advertisers?”. Work in progress.


Prior studies indicate the protective role of Ultraviolet-B (UVB) radiation in human health, mediated by vitamin D synthesis. In our research, we empirically outline a negative association of UVB radiation as measured by ultraviolet index (UVI) with the number of COVID-19 deaths. In order to test the robustness of this negative association, we test whether the association vanishes if people stay inside due non-pharmaceutical public health measures such as lockdowns or due to natural phenomena such as monsoon.


Moozhipurath, R.K., Kraft, L. & Skiera, B. “Evidence of protective role of Ultraviolet-B (UVB) radiation in reducing COVID-19 deaths”. Scientific Reports 10, 17705 (2020).

Moozhipurath, R.K., Kraft, L. “Does Lockdown Decrease the Protective Role of Ultraviolet-B (UVB) Radiation in Reducing COVID-19 Deaths?”. Under 1st round of review in Nutrition & Diabetes.

Moozhipurath, R.K., Kraft, L. “Implications of Monsoon Season & UVB Radiation for COVID-19 in India?”. Under 1st round of review in Scientific Reports.

Policy Analysis

Policies should be designed to mitigate or solve problems of societies effectively and efficiently. This part of my research analyzes the intended and unintended consequences of policies such as work permit regulations and privacy laws. For example, we outline that the EU Blue Card shifts wages of graduating non-EU students in Germany and only find a minor effect on their likelihood to stay in Germany.

Kraft, L. & Qendrai, P. “Work Permit Regulations and Labor Market Outcomes of Non-EU Graduates in Germany”. Work in progress.

Skiera, B., Jin, Y., Kraft, L., Laub, R., Miller, K. & Schmitt, J. “Impact of GDPR and other Privacy Laws on Different Actors in the Online Advertising Industry”. Work in progress.


Lennart Kraft



Raum 1.202 im RuW-Gebäude
Theodor-W.-Adorno-Platz 4
D-60323 Frankfurt am Main