The relevant link is not simply “there was a cartel, therefore there was a loss”. The claimant must show how the conduct affected the actual price, sales opportunity or other economic position. For a purchaser, the purchasing period, product, supply level and price may be decisive. A competitor needs a plausible comparison with the development that would have occurred without the coordinated conduct.
The directive leaves national causation rules in place, but requires effective enforcement of the EU right to compensation. This does not mean that every economic decline is recoverable. Other causes such as changes in demand, supply shortages, the claimant’s own capacity limits or an independent price trend must be considered.
For the first review, list each affected transaction with date, quantity, supplier, price and payment record. Competitors should also organise customer movements, lost orders, capacity, offers and comparison periods. A clear timeline is often more useful than an unannotated collection of invoices.