Reason for the inquiry was a complaint that cement producers are selling cement to a very high price (mostly to concrete suppliers) while the concrete price was reduced enormously.
BWB has sent out 27 letters of request and presents now the results.
Unfortunatly the report is only available in german.
Summarising it deal with defining the market, market shares of different companies, possiblities of market abuse, margin squeeze and predatory pricing. As a result no infringement could be proved.