A new Economist article questions whether the massive shift toward passive investment is distorting stock valuations. As investors pour money into low-cost index funds, active management shrinks. This raises fears that market signals are weakening, potentially creating a stockmarket bubble where price discovery suffers and fundamentals take a back seat to capital flows.

The core worry is that passive inflows mechanically lift every stock within an index, regardless of individual merit. When a company gets added to a major benchmark, it sees automatic buying pressure. This can prop up underperforming firms and inflate overall market valuations, making it harder for active managers to fight the tide.

With passive strategies now commanding trillions in assets, their influence on corporate governance and capital allocation is undeniable. Investors should watch for any shift in fund flows or regulatory scrutiny of index providers. The key question remains: will active managers eventually reclaim their edge if market inefficiencies grow too large?