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Hi there, I'm Cem!

I am a postdoctoral researcher at the School of Management, Polytechnic University of Milan since September 1, 2022. Formerly, I was a PhD student at Erasmus School of Economics.

My research develops Bayesian methods to elicit and aggregate preferences, beliefs and judgments.

Applications include truthful elicitation in surveys and experiments, identifying experts in forecasting, harnessing the wisdom of crowds, preference aggregation for social choice etc.

I use insights and tools from Decision Theory, Experimental Economics and Behavioral Economics.


Peker, C. (2022). Extracting the collective wisdom in probabilistic judgments. Theory and Decision. doi: 10.1007/s11238-022-09899-4

(Supplemental Material, Presentation)

Peker, C. (in press). Incentives for self-extremized expert judgments to alleviate the shared-information problem. Decision (Special Issue on the Wisdom of Crowds). doi:10.1037/dec0000198

(Accepted Manuscript ,Supplemental Material)

Working Papers

Peer prediction markets to elicit unverifiable information (pdf)

(joint with Aurélien Baillon and Sophie van der Zee)

Robust recalibration of aggregate probability forecasts using meta-beliefs (pdf)

(joint with Tom Wilkening)

The wisdom of expert crowds in evaluating research projects

(joint with Chiara Franzoni and Massimiliano Guerini)

Using prediction interval skewness to improve forecast accuracy

(joint with Yael Grushka-Cockayne, Victor R.R. Jose, Jacob Rittich and Jack Soll)

Teaching Experience

My teaching interests:

  • Microeconomics
  • Behavioral Economics, Biases in Judgment and Decision Making
  • Experimental Economics
  • Quantitative Methods / Statistics (in particular using R and Python)

At Erasmus School of Economics, I teach Applied Behavioral Economics in the masters' programme. I supervise experimental projects that apply behavioral insights in practical problems.

I also regularly supervise bachelors' and masters' theses in Behavioral Economics.

In the past, I have been a TA in various courses in Tinbergen Institute and Bogazici University, Turkey.

You can find my CV here