(11)Information on costs is important for retail investors when comparing different PRIIPs, which can have different cost structures, and when considering how the cost structure of a particular PRIIP might apply to them, which depends on how long they are invested, how much they invest, and how well the PRIIP performs. For this reason, the key information document should contain information that allows the retail investor to compare the overall total cost levels between different PRIIPs when held for their recommended holding periods and shorter periods, and to understand how these costs might vary and evolve over time.