# Surviving a Market Crash: 3 Rules That Work Diversify, rebalance and keep your SIPs running: the boring strategy that survived 1929, 2008 and COVID, with a simple portfolio mix for Indian investors. By Nikhil Varghese, CA · 19 September 2025 · https://finniki.com/blog/strategy-that-survived-every-crash **Quick answer:** The strategy that has survived every major crash of the last 100 years is boring: **diversify** across assets that do not all fall together, **rebalance** back to your target mix (especially during a crash), and **keep investing every month** through SIPs. In 2008 the S&P 500 fell about **38%**, while a simple 60% stocks, 40% bonds portfolio fell about **22%** and recovered faster. What fails is emotion: timing the market, panic selling and hiding in one "safe" asset. The strategy only works if you stick to it when everyone else is panicking. [Watch the episode: The only strategy that survived every market crash](https://youtu.be/0zz69kX4XiE) ## Why do stock markets crash? Crashes are chain reactions that usually need three things: **overvaluation** (too much optimism), a **trigger event**, and **panic selling** that spreads. Each major crash had its own trigger: - **1929, the Great Depression:** people bought shares with borrowed money. When prices fell, forced selling created a death spiral, and US stocks fell nearly **80%**. - **1970s oil shocks:** oil prices quadrupled, and stagflation (high inflation with stagnant growth) crushed economies and profits. - **2008, the subprime crisis:** reckless lending and bad home loans packaged into complex products collapsed when house prices fell, taking banks down with them. - **2020, COVID:** lockdowns shut the world economy almost overnight, and markets fell more than **35%** in weeks. ## Why do people make crashes worse? Because fear is contagious. Three forces turn a fall into a crash: - **Panic selling:** when the future looks grim, investors believe "this time is different" and sell at the worst moment. - **Herd mentality:** as prices fall, more people join the sell-off because everyone else is selling. - **Liquidity crunches:** investors who borrowed to invest are forced to sell to cover their loans, which pushes prices lower still. History's simple truth is that crashes are temporary: economies heal and markets recover. The question is whether your portfolio, and your nerve, survive long enough to see it. ## What should you not do in a market crash? Avoid the three reactions that almost always fail: 1. **Timing the market.** Nobody rings a bell at the top or the bottom. Selling before a crash and buying back at the low is a guess, and it costs investors heavily. 2. **Panic selling.** It turns a temporary fall into a permanent loss. 3. **Hiding in one "safe" asset.** Only FDs, only gold or only property feels safe in the short term, but over decades inflation eats it or you miss the growth. Every one of these is an emotional reaction, not a plan. ## What is the strategy that survived every crash? Diversification, rebalancing and steady investing, used together. ![The crash-survival strategy has three rules: diversify, rebalance and keep investing.](https://finniki.com/blog/media/4170de529907da491691464b.jpg) ### 1. Diversify across assets Spread your money across assets that do not move together: shares, bonds, gold and perhaps property. When shares crash, bonds often cushion the fall; when both struggle, gold has often held up. Take the classic **60/40 portfolio**, 60% shares and 40% bonds: - **Great Depression:** shares fell nearly 80%; the 60/40 mix fell less, about 53%, and recovered faster. - **1970s stagflation:** shares fell over 50%; a 60/40 portfolio recovered in roughly nine years, faster than shares alone. - **2008:** the S&P 500 fell about **38%**; a 60/40 portfolio fell about **22%**, nearly half the damage. - **2020:** diversified investors were back in profit within months. ![In 2008 an all-share portfolio fell about 38%, while a 60/40 shares and bonds portfolio fell about 22%.](https://finniki.com/blog/media/254ee2bcda5e1224a4e2fb87.jpg) ### 2. Rebalance back to your target Rebalancing means bringing your portfolio back to its target mix. Start at 60% shares and 40% bonds, and after a crash you might be at 45% shares and 55% bonds: safer, but with less to gain from the recovery. Rebalancing means selling some bonds, which held up, and buying shares, which are now cheap. By 2013, shares bought at the 2008 lows had doubled or more. There are three ways to do it: - **Calendar-based:** check every quarter or once a year and readjust if the mix has drifted. - **Threshold-based:** rebalance whenever an asset moves well away from its target, say shares fall to 50% or rise to 70%. - **Crisis-based:** use the crash itself as the signal to rebalance, instead of a reason to panic. Diversification gives you a safety net; rebalancing turns the ups and downs into a buy-low, sell-high habit without guessing. ### 3. Keep investing through SIPs A SIP invests a fixed amount every month. Invest ₹1,000 when a fund's NAV is ₹100 and you buy 10 units; when it falls to ₹80, the same ₹1,000 buys **12.5 units**. You automatically buy more when prices are low and fewer when they are high, which lowers your average cost. In a crash, the dips work for you: the extra units bought cheaply lift your portfolio when the market recovers. The catch is discipline. In March 2020 many investors stopped their SIPs in panic; those who kept going saw their investments roughly **double in about 18 months**. ## How does Warren Buffett handle crashes? By being ready to buy when others panic. His rule: "Be fearful when others are greedy, and greedy when others are fearful." Berkshire Hathaway's share value has compounded at about **20% a year since 1965**, roughly double the S&P 500. Berkshire keeps a very large cash pile, which was over **$380 billion** in late 2025, so it can buy strong businesses cheaply when markets fall. Buffett handed over as chief executive to **Greg Abel** at the start of 2026 and remains chairman; the discipline, not prediction, is the lesson. ## How do you build a crash-resistant portfolio? A simple mix to start from, adjusted for your age, goals and risk appetite: - **50 to 60% equity**, through index funds or well-diversified mutual funds. Up to **70%** if you are young and comfortable with more risk. - **25 to 35% debt**, a mix of government and good-quality corporate bonds or debt funds. - **10 to 15% gold, commodities or other alternatives** such as REITs. - **5 to 10% cash**, not idle but ready to buy when markets fall. ![A crash-resistant mix: roughly 50 to 60% equity, 25 to 35% debt, 10 to 15% gold or other assets, and 5 to 10% cash.](https://finniki.com/blog/media/a56d3e68452f8a23b8c9d271.jpg) If managing this yourself feels like a hassle, **multi-asset allocation funds** diversify and rebalance for you. Doing it yourself is not much effort, though, and it keeps you in control. ## Can diversification fail? Yes, occasionally. In **2022**, shares and bonds fell together as inflation and interest rates rose, and the old shares-plus-bonds mix was not enough. Portfolios with gold and commodities did far better. That is why modern portfolios add commodities, inflation-protected bonds and global exposure. For Indian investors there is one more layer: the rupee. In global crises the rupee often weakens, so international funds can fall less in rupee terms than the foreign market itself. At home, spread across large-cap, mid-cap, debt and gold so the portfolio is not leaning on one leg. The goal is not a perfect portfolio but a resilient one that bends without breaking. ## FAQs ### What is the best strategy to survive a stock market crash? Diversify across asset classes, rebalance back to your target mix, keep investing through SIPs and avoid panic selling. ### Should I stop my SIP when the market crashes? No. A crash is when a SIP buys the most units for your money, and investors who kept their SIPs going through March 2020 saw them roughly double in about 18 months. ### What is a 60/40 portfolio? A portfolio with 60% in shares and 40% in bonds. In 2008 it fell about 22% against about 38% for the S&P 500. ### What is rebalancing? Bringing your portfolio back to its target mix by selling some of what has risen and buying what has fallen. You can do it on a schedule, when an asset drifts past a threshold or during a crisis. ### Is gold a good hedge in a crash? Often. When shares and bonds struggle together, as in 2022, gold and commodities have tended to cushion a portfolio. ### Does diversification always work? Not always. In 2022 shares and bonds fell together, which is why adding gold, commodities and global exposure makes a portfolio more resilient. ## Build a portfolio that can take a crash The right mix depends on your age, goals and how much volatility you can live with. [Book a session](https://finniki.com/book) to set your allocation and a rebalancing rule you will actually follow, or find more episodes on [FinNiki videos](https://finniki.com/videos).