Here is an interesting article about corruption in Public Procurement. It is mainly focused on the U.K. but nevertheless contains “interesting” figures. The article lacks a bit of context and references. But, the questions it raises are important ones in Public Procurement.
For example, less and less participation to bids. Sign of corruption / rigged system? Or, a sign of high barrier to entry?
Here is the article: A rigged system? Corruption in European government buying – Understanding spend