The Undeniable Allure of 'Set and Forget'
For years, investors have been flocking to passive funds, and it's easy to see why. These investment vehicles, which include popular options like Nifty 50 Exchange Traded Funds (ETFs) and Sensex-based index funds, are designed to be straightforward. Instead
of relying on a fund manager to actively pick winning stocks, a passive fund simply aims to mirror a specific market index. The appeal is powerful: you get instant diversification across many companies, significantly lower management fees because there's no star manager to pay, and a strategy that has historically performed well over the long term. For many, especially those new to investing, it feels like the perfect 'set and forget' solution to building wealth without the headache of stock picking.
The Market Risk You Can't Escape
The most fundamental risk in any passive fund is one you can't diversify away: market risk, also known as systematic risk. A passive fund is designed to track the market, for better or for worse. If the index it follows goes up, your investment value rises. But if the entire market takes a nosedive, your fund is going down with it. Passive funds have no built-in defense mechanism to soften the blow during a downturn. An active manager might sell off holdings and move to cash to protect capital, but a passive fund is bound by its mandate to keep tracking the index, even on the way down. This means investors are fully exposed to broad market sentiment, economic shocks, and geopolitical events that can rattle all stocks at once.
The Hidden Danger of Concentration
Many investors believe buying an index fund gives them broad, equal exposure to the entire market. In reality, that's often not the case due to concentration risk. Most major indices, including India's Nifty 50, are market-cap-weighted. This means the largest companies have a disproportionately large impact on the index's performance. For example, a handful of giant financial and tech companies can make up a substantial portion of the Nifty 50's total value. This creates a hidden vulnerability: if just a few of these top-heavy stocks perform poorly, they can drag the entire index—and your fund—down with them, even if the other 40+ companies are doing fine. You might think you own the market, but you're actually making a concentrated bet on the continued success of a few titans.
The Liquidity Squeeze in a Panic
ETFs are praised for their liquidity, as they can be bought and sold like stocks throughout the trading day. However, this liquidity can evaporate during times of extreme market stress. The risk works on two levels. On the secondary market, if everyone rushes to sell their ETF units at once during a crash, there may not be enough buyers, causing the ETF's market price to fall significantly below the actual value of its underlying stocks (its Net Asset Value or NAV). At the same time, the fund itself faces primary market liquidity risk. If the underlying assets the ETF holds—like certain bonds or smaller stocks—are themselves illiquid, the fund manager may struggle to sell them to meet redemption requests without incurring steep losses. This can create a scenario where you can't sell your ETF at a fair price precisely when you need to most.
Chasing the Index Isn't Always Perfect
Finally, there is tracking error. In theory, a passive fund should perfectly replicate the returns of its benchmark index. In practice, this is rarely the case. Tracking error is the deviation between the fund's performance and the index's performance. This gap can be caused by several factors, including the fund's management fees, transaction costs from buying and selling securities to rebalance, and the fund's cash holdings. While often small, a persistent tracking error means your investment will consistently lag the very index it is supposed to match, acting as a small but constant drag on your returns over time.
