Invest in broad index funds. They are not just mathematically sound; they are psychologically easier to live with. Trying to beat the market makes bad years feel more personal, which makes the strategy harder to stick with during difficult periods. That makes broad indexing a strong fit for Epicurean finance, which favors systems that reduce anxiety, panic, regret, and self-sabotage.
Use a default you can actually live with
A broad index approach solves a very ordinary but very important problem: it gives you a serious way to invest without turning every market move into a referendum on your own intelligence. A broad index fund will still rise and fall with the market, and those down years are never fun. What this approach often removes is the extra drama of wondering whether ordinary market risk caused the pain or whether your latest attempt to outsmart everyone else caused it.
That is a real advantage, not a soft side benefit. A simple index strategy gives you low costs, wide diversification, and few moving parts, but the psychological simplification may matter just as much as the financial simplification. You have less to optimize, which means you have less to obsess over, less to defend, and less to regret.
Many people do not need a portfolio that makes them feel brilliant. They need a portfolio that does not lure them into doing something dumb three times a year. Index funds help by being boring in a useful way. They offer less excitement, but they also create fewer opportunities for ego, panic, and second-guessing to take over the controls. For many investors, an S&P 500 fund is the simplest practical version of this broader indexing idea.
Why trying to beat the market is harder to stick with
Trying to beat the market adds a second layer of pain that a simple index approach often avoids. The first layer is just financial loss, and that exists no matter what you own. The second layer is personal meaning: the feeling that the loss says something embarrassing about you, your judgment, or your need to prove that you were smarter than the average investor.
That second layer matters because it changes the emotional texture of bad years. An index investor can say, "The market is down." A stock picker or market timer is more likely to say, "I was wrong." Those statements do not hit with the same emotional force, even when the dollar losses are similar. One sounds like misfortune; the other sounds like self-blame.
This is where a strategy can fail psychologically even if it looks respectable on paper. The spreadsheet may not care whether you feel foolish, but you will care, and that feeling can change your behavior. A strategy that keeps making its owner feel stupid becomes harder to hold precisely when holding matters most.
Regret aversion: active choices leave sharper scars
One reason index funds are easier to stick with is that active choices create sharper regret when they go wrong. Behavioral-finance work on regret aversion points in exactly this direction: people react especially strongly to outcomes that they tie to their own decisions, and that reaction can drive paralysis, overreaction, or hasty attempts to undo the earlier choice.
That is why "I owned the market and the market went down" feels different from "I picked this loser," "I sold before the rebound," or "I thought I had found a better strategy." The second category is much more likely to send a person mentally pacing the hallway at 2 a.m. and reopening old decisions like unsolved crimes. That sort of regret does not just hurt; it pressures people to act, to switch, and to try to erase the previous mistake by making a fresh one.
A diversified index strategy narrows the field of possible regrets. It does not remove regret completely, because no serious investing strategy can do that, but it strips away many of the personalized versions that make people desperate to reassert control. The market already supplies enough pain on its own. There is no reason to pay extra for the custom package that includes engraved self-reproach.
Loss aversion: losses hurt worse when they feel self-authored
Loss aversion is not just the idea that losses sting more than gains of the same size feel good. It also reminds us that losses hit with an emotional asymmetry, which helps explain why Kahneman and Tversky's prospect theory became so influential in the first place.
When you attach the loss to your own clever move, your own stock picks, or your own tactical brilliance, the loss often feels more avoidable, and that makes it harder to bear. A broad market decline hurts because your balance is down. A self-authored loss hurts because your balance is down and because you feel implicated in the result. That extra sense of authorship turns pain into rumination.
That is a bad setup for a long-term investor. Once a person starts telling himself, "I did this to myself," the urge to escape is no longer just about money. It becomes an urge to escape embarrassment, guilt, and the feeling of having failed an intelligence test that never needed to be taken. That is exactly the sort of emotional escalation that leads people to sell low, abandon workable plans, or lunge toward a new strategy in hopes of washing off the old shame.
Shared experience helps people stay put
Broad indexing also has a social and emotional advantage that is easy to underrate. When you own a broad index, bad years feel more collective. You are not alone in a private little theater of disappointment, wondering whether your own special theory just blew up. You are going through a rough market alongside a great many other investors, and that shared experience changes how the pain lands.
This does not make losses pleasant, and it certainly does not mean crowds are always wise. What it does mean is that common suffering is often easier to absorb than private embarrassment. "The market is down" is easier for most people to metabolize than "my brilliant plan failed." The first feels like a hard season. The second feels like exposure.
That difference matters because shame thrives in isolation. A broad index does not prevent fear, but it can keep fear from hardening into humiliation. Being in the same boat as everyone else is still uncomfortable in a storm, but it is usually easier to endure than floating alone on a raft you built yourself while wondering whether the leak is in the wood or in your personality.
Epicurean finance favors systems like this
This is exactly why broad index investing fits the Epicurean finance framework so well. Epicurean finance does not reject good math in favor of feelings. It asks a more complete question. It asks not just, "What has respectable expected returns?" but also, "What kind of system is easiest to live with over the course of an actual human life?"
That wider question changes how we should judge financial advice. Charts, backtests, and lectures about discipline do not scold away human biases. Very often, we should treat those biases as planning constraints instead. Loss aversion, regret aversion, envy, and the desire to avoid feeling uniquely foolish are part of the terrain. Good systems respect the terrain instead of pretending the terrain should stop being terrain.
From that angle, this approach appeals partly because it reduces avoidable suffering without abandoning sound financial logic. It gives the investor fewer opportunities to confuse ordinary market pain with a personal indictment. It gives ego less raw material to work with, which is sometimes the kindest service a financial system can perform. In Epicurean terms, that is not a side issue. It is part of what makes the strategy good.
Why the S&P 500 remains a strong default
The S&P 500 is a compelling default because it gives you broad ownership of major U.S. companies in one simple package. S&P Dow Jones Indices describes it as the best single gauge of large-cap U.S. equities and says it covers about 80% of available U.S. stock market capitalization. Over the long run, that breadth has paid off. In Aswath Damodaran's historical return series, \$100 invested in the S&P 500 with dividends reinvested at the start of 1928 grew to about \$1.16 million by the end of 2025, which works out to about a 10.0% annualized return over 98 years.
That long-run record matters because the case for the S&P 500 is not that it is soothing. The case is that it has historically rewarded patience. Hartford Funds reports 27 bear markets since 1928, with an average decline of 35.24% and an average length of 289 days, while also noting that stocks have been rising about 78% of the time over the last 95 years. And if we narrow the focus to the truly severe drawdowns in Hartford's table, declines worse than 50% were rare: 1931-32, 1937-38, and 2007-08.
Those three episodes were painful, but the recovery record still matters. Morningstar's long-run market history shows that the market had recovered from the 1929-32 collapse by late 1936 before the separate 1937-38 downturn began. It shows that the market recovered from the 1937-38 decline by February 1945. It shows that the market recovered from the 2007-09 crisis in May 2013. That does not make crashes pleasant, but it does show that investors have historically endured severe declines rather than treating them as events that permanently nullified the case for owning the index.
One important qualification is that the 1929-32 collapse was amplified by conditions that are no longer in existence. There was no federal deposit insurance, so bank runs and bank failures could cascade through the financial system, and the United States was still on the gold standard, which sharply limited the policy response and deepened deflation. Those conditions are gone. That does not mean severe bear markets are impossible, but it does mean a Depression-style collapse lasting that long is less likely for those same reasons.
That is the real sales pitch. The S&P 500 does not spare you from volatility, but it gives you broad ownership, serious diversification, and a very long history of rewarding people who stayed put. Morgan Stanley notes that individual stocks suffer much larger drawdowns than diversified portfolios such as the S&P 500; in its sample, the index's maximum drawdown was 58%, versus a median 72% drawdown even for the top-performing individual stocks. That makes the S&P 500 a strong default not because it avoids pain, but because it pairs long-run growth with a form of pain that is easier to survive than the private humiliation of trying to prove you were smarter than the market.
Important nuance
None of this means broad index investing is painless or magical. Broad indexes can fall hard, stay down longer than people expect, and test anybody's nerves. A person can absolutely panic while holding the S&P 500, and bad headlines can still make a simple strategy feel suddenly inadequate, naive, or obsolete.
It also does not mean that no one should ever do anything more complicated. Some investors can tolerate complexity and stick with it just fine. Others have tax, professional, or institutional reasons for building something broader than a plain index approach. The claim here is simpler: broad indexing is a sturdier default because it removes unnecessary psychological friction while still respecting sound financial reasoning.
That distinction matters because the argument is not that indexing guarantees peace. The argument is that it removes one important category of avoidable pain. It does not stop markets from being unpleasant, but it does reduce the chance that an ordinary bad year will become a personal humiliation and then turn into a worse decision.