Collusion Detection in Public Procurement with Limited Information - Economic Research Forum (ERF)

Collusion Detection in Public Procurement with Limited Information

Bedri Kamil Onur Tas

August, 2017


27 pages

D4. Market Structure and Pricing
C3. Multiple or Simultaneous Equation Models
H5. National Government Expenditures and Related Policies

Public procurement data sets usually lack detailed data that are needed to implement existing methods. We design a method to identify and test for bid rigging in procurement auctions with limited information. The method can be applied to limited data sets using standard econometric tools and software. We implement the methodology to a unique data set about all Turkish public procurement auctions in years 2005-2012, numbering 565,297. We uncover the structure of collusive behavior in Turkish public procurement auctions. We find that collusion significantly increases procurement costs and decreases procurement efficiency.


عادة ما تفتقر مجموعات بيانات المشتريات العامة إلى البيانات المفصلة اللازمة لتنفيذ الأساليب القائمة. نقوم بتصميم طريقة لتحديد واختبار تزوير العطاءات في مزادات المشتريات بمعلومات محدودة. ويمكن تطبيق هذه الطريقة على مجموعات البيانات المحدودة باستخدام الأدوات القياسية الاقتصادية والبرمجيات. ونقوم بتطبيق المنهجية على مجموعة بيانات فريدة عن جميع مزادات المشتريات العامة التركية في السنوات 2005-2012، وعددها 565،297. نكتشف بنية السلوك التواطئي في مزادات المشتريات العامة التركية. ونجد أن التواطؤ يزيد كثيرا من تكاليف المشتريات ويقلل من كفاءة المشتريات.

Research Fellows

Bedri Kamil Onur Tas

Associate Professor, TOBB University of Economics and Technology



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