Consider this: If 1000 monkeys had constructed portfolios of Indian stocks in the calendar year 2021, how many of those 1000 portfolios would have beaten the BSE 500 index after 3 years?
The surprising answer: ALMOST ALL OF THEM (997 of 1000).
No, these aren’t specially gifted/ trained primates; they’re random monkeys with random portfolios. We conducted a simulation with 1000 random portfolios. Each portfolio picked 100 equal weighted stocks at random from the BSE 500 universe in calendar year 2021. To remove starting period bias, we excluded period from May 2020 to December 2020 (marked by a sharp recovery from Covid-19 lows). Additionally, we assumed that stocks were added on a monthly basis throughout calendar year 2021. Then, on March 31, 2024, we compared the performance of these 1000 portfolios with that of the BSE 500 index, assuming a similar monthly purchases of the index. Remarkably, almost all monkey portfolios outperformed BSE 500’s 15% annualised returns from 2021 to March 2024, recording a median return of 22% p.a.
The secret behind this superlative performance lies in the starting point and market’s direction during the study period. Stocks have been on a relentless ascent since Covid-19 lows in May 2020. Many small and midcap BSE 500 stocks with less than 1% weight in the index have surged 3x to 12x. An equally weighted portfolio of random 100 stocks would allocate 1% weight to these stocks. Just a few such stocks are sufficient to improve the portfolio performance materially. Moreover, hardly any stock experienced significant declines to drag down the overall performance. If these portfolios were allowed to include micro caps, IPOs and SME IPO stocks (currently excluded) or reduce the number of stocks from 100 to say 50 or even 30, their performance would have risen further (100% outperformance; over 22% median return).
This outcome – call it beginner’s luck – mirrors the experience of many new investors who entered equity markets post Covid-19. Consistently beating the index is challenging even for seasoned investors. So, after outperforming the index over 3 years, many novice investors may start to believe that they possess a Midas touch for stock picking. However, in reality, the past 3 years’ success is largely attributable to luck. Worryingly, nothing sets up someone for financial and/or emotional ruin more than luck mistaken as skill and/ or an imprudent approach rewarded handsomely. Emboldened by their riches, many investors will raise their bets (trade in options, dabble in stocks of questionable companies etc.) precisely at the wrong time, and fall victim to the winner’s curse.
We also conducted a reality check: we made those 1000 monkeys repeat the same exercise in calendar year 2018. How many of them would have beaten the BSE 500 by June 2020? Only 200 out of 1000, with a median return of -6%. The reason? The markets were in decline from 2018 to June 2020.
Liquidity can propel stock prices to any level in the short term. However, fundamentals and valuations ultimately serve as anchors. Until then, ironically, a thoughtful investing approach may seem foolish, while a foolish investing approach may appear thoughtful. It’s therefore difficult to correctly evaluate performance in a uni-directionally rising market. The true test of investment skill lies in a falling market. Correct evaluation period should encompass a full market cycle, not just one phase as is the case with last three years. A full cycle is when margins and multiples both mean revert. A strong performance across full cycle results from being mindful of risks in a rising market and maintaining the price and quality discipline consistently.
