The concept of the "beta adjusted fee demarcation line," which illustrates a 45-degree angle between expense ratio and active share, is proving effective in the European ETF market. This model, likened to a financial E=Mc², indicates that the most successful ETFs are positioned above this line, while those below it are experiencing significant outflows. The trend highlights the growing perception that beta exposure is now considered a commodity, leading investors to favor ETFs that offer more active management for their fees.