In attaching Member States to sectors, we sought to ensure that the sample for each case study was balanced in terms of the relative importance of the sector in total public procurement and that the sample was geographically diverse. For example, the average value of a public contract in the Polish construction sector is substantially greater than that of any other sector whereas the sector has only the second-highest average contract value in the UK. Similarly, the average contract value of transport services in Germany is higher than in any other sector whereas the average value in the Czech Republic is relatively low compared to other sectors.
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