๐Stocks
Stocks are the most studied financial asset class on earth, and the single most consistent finding across 70 years of academic research is brutal in its simplicity: over any 10-year window, 80-90% of actively managed funds underperform a simple, low-cost broad market index fund. The S&P 500 index, which in its current 500-company form has existed since March 4, 1957, has returned roughly 10% per year on average over the long run including dividends, with periodic crashes of 30-50% along the way. Anyone who held through the 1987 crash, the 2000 dot-com crash, the 2008 financial crisis, the 2020 COVID crash, and the 2022 bear market and reinvested dividends now sits on enormous wealth. Anyone who tried to time these events almost universally underperformed. This is the most important and least intuitive thing about stocks: doing nothing beats doing something for the vast majority of investors. And yet, the brokerage industry, the financial media, and a thousand TikTok stock pickers all need you to believe otherwise to justify their existence. The boring truth: buy a total US or total world stock index fund, contribute monthly through every market mood, ignore the news, hold for decades. That single strategy has built more wealth than every cryptocurrency portfolio, every options trader, and every meme stock punt combined. This page is the playbook. Run a poll on moomz asking your friends if they own individual stocks or only index funds โ the split is informative.
Why index funds beat almost everyone
Index funds buy every company in a defined index (S&P 500, total US market, total world) at very low cost โ Vanguard's VOO and VTI charge 0.03% annually, Fidelity offers true zero-fee index funds. Because the index is the market, owning the index is equivalent to owning the market's return minus a tiny fee. Active managers try to beat the index by picking better stocks, but their fees, trading costs, taxes, and the simple math that for one manager to beat the market another must lose โ combined with the rise of efficient pricing through high-frequency trading โ mean that beating the index consistently is statistically improbable. SPIVA reports from S&P Dow Jones show that over 15-year periods, more than 90% of large-cap active US mutual funds underperform their benchmark. Even professional, well-paid, full-time stock pickers lose this game. Retail investors picking individual stocks based on Reddit threads, YouTube channels, or gut feelings face vastly worse odds. The math is not subtle, and yet the cultural narrative around "stock picking" persists because it is entertaining.
How to actually build a stock portfolio in 2026
The simplest, most evidence-based portfolio: 70-80% in a total US stock index (VTI, ITOT, FXAIX) + 20-30% in total international stocks (VXUS, IXUS), held in a mix of tax-advantaged accounts (Roth IRA, 401k) and a taxable brokerage account. Automate weekly or monthly contributions and never look at the balance more than quarterly. For investors under 35 with 30+ year horizons, 100% equities is defensible โ the cost of being too conservative early is enormous because you miss decades of compounding. For investors closer to retirement, gradually add bonds (BND, AGG) to dampen volatility, typically following the rule "age in bonds" minus 10-20 (so a 50-year-old might hold 30-40% bonds). Avoid: leveraged ETFs (TQQQ, SOXL) for long-term holds because the decay math destroys returns over years, individual high-conviction stocks beyond 5-10% of net worth, sector ETFs you cannot justify a thesis for, and any product marketed as "smart beta" or "factor investing" that charges over 0.3%.
When to buy and when not to sell
The best time to buy stocks was 20 years ago. The second best is today. The worst is during a panic-driven sell-off โ which is exactly when most retail investors sell. Dollar-cost averaging weekly or monthly removes timing risk and emotion: you buy the same dollar amount no matter what, so you naturally buy more shares when prices are low. The lump-sum vs DCA debate has been studied to death: lump-sum wins about 65% of the time mathematically because markets trend up, but DCA wins on psychology because it prevents catastrophic entry at a peak. Selling: the only good reasons to sell are 1) rebalancing to your target allocation, 2) you need the money for a planned expense, 3) tax-loss harvesting in a taxable account. Bad reasons to sell: the news is scary, your friend told you about a hot tip, you are afraid of losing more, the chart looks bad. Decades of research show that investors who check their portfolio rarely outperform those who check frequently โ a phenomenon called "myopic loss aversion." If watching the market makes you anxious, the right answer is to look less, not to sell.
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Frequently asked
Q.What is the S&P 500 and why does everyone talk about it?+
The S&P 500 is an index of 500 large publicly traded US companies, created in its current form on March 4, 1957 by Standard & Poor's. It represents roughly 80% of the total US stock market by value and is the most widely tracked benchmark in the world. Index funds tracking the S&P 500 (VOO, IVV, SPY) let any investor buy a slice of all 500 companies for 0.03-0.09% annual cost. Long-term average return is roughly 10% per year before inflation and roughly 7% after.
Q.Should I buy individual stocks or index funds?+
For 90%+ of investors, index funds. Individual stock picking requires time, skill, and a willingness to underperform the simple index for years at a time. Academic and industry research consistently shows that most professional stock pickers, with full-time teams and decades of experience, underperform the index over 10-15 year windows. If you enjoy researching companies, allocate 5-10% of your portfolio to individual stocks for fun and skill development โ keep the other 90% in index funds where the real wealth gets built.
Q.How much money do I need to start investing in stocks?+
In 2026 you can start with $1 thanks to fractional shares at any major broker (Fidelity, Schwab, Vanguard, Robinhood). The barrier to entry is essentially gone. The right amount is whatever you can contribute consistently every month after building a small emergency fund and paying off high-interest debt. Even $50/month compounded at 8% annual return becomes over $150,000 after 40 years. Starting matters far more than starting big.
Q.When should I sell my stocks?+
Almost never in response to news, fear, or short-term price movements. Good reasons to sell: 1) you are rebalancing to your target asset allocation, 2) you need the cash for a planned expense within 5 years, 3) tax-loss harvesting in a taxable brokerage account. Bad reasons: the market is down, the market is up, you are anxious, your cousin told you to. The biggest destroyer of long-term returns for retail investors is selling during bear markets and missing the recovery, which historically has come within 1-3 years every time.