Just Keep Buying: A Strong Habit, Not a Complete Plan

In April 2017, Nick Maggiulli published a short post on his blog Of Dollars and Data with the title Just Keep Buying. He defined the phrase plainly: it is “the continual purchase of a diverse set of income-producing assets.” Five years later he turned the idea into a 2022 book by the same name. The slogan stuck because it captures something most personal-finance advice gets wrong: timing matters less than habit, and headlines matter less than automation.

The slogan is also incomplete. “Just keep buying” is excellent advice for the accumulation phase of an already-funded financial plan. It says nothing about which dollars to invest, which assets to choose, what to do with near-term cash, how to handle concentrated single-stock positions, or what changes when you stop earning. This guide works through what the rule gets right, what it leaves out, and the one piece of math from Maggiulli’s book that every accumulator should run on their own situation: the savings-vs-returns crossover.

What Maggiulli Actually Says

Two things are worth reading directly from Maggiulli’s 2017 post. First, his definition is about income-producing assets, broadly diversified. Stocks, bonds, REITs, index funds. Not single-stock dip buying, not crypto, not options. Second, his case for continual buying rests on the cost of waiting:

“The only problem with this approach is the market could go up for a significant period of time before a correction happens.”

Maggiulli illustrated this with the 2012-to-2017 period: a patient investor waiting for a correction in early 2012 would have missed roughly a 70% gain through early 2017 before any meaningful correction arrived. The empirical case against waiting has only strengthened since. Summitward’s companion guide on The Problem With Buy the Dip works through the AQR, Vanguard, Dimensional, PWL, and Morningstar evidence that waiting in cash for a better entry usually loses to investing today.

His own framing is closer to dollar-cost averaging with a psychological wrapper: “think of buying investments like you buy food, do it often.” The mantra is the point. A rule that survives stress is more useful than a sophisticated strategy that gets abandoned during drawdowns.

The Insight Most Peer Posts Miss: The Crossover

Maggiulli’s book contains an idea that almost no “just keep buying” book review picks up: at low wealth, your savings rate dominates your wealth growth. At high wealth, your investment return dominates. There is a year when these cross over, and the year matters.

Run the math on a household saving $40,000 per year (growing with 3% raises) starting with a $100,000 portfolio at a 5% real return:

• Year 1: contributions add $40,000. Portfolio return adds about $5,000. Contributions dominate eight to one.
• Year 10: portfolio is roughly $730,000. Year-10 return is about $32,000 versus contributions of $52,000. Savings still drive most of the growth.
• Year 16: portfolio is roughly $1.37 million. Year-16 return ($63,000) finally edges past year-16 contributions ($62,000). This is the crossover.
• Year 25: portfolio is roughly $2.9 million. Year-25 return is about $135,000 versus contributions of $81,000. Returns now drive most of the wealth growth.

The crossover year reframes the entire investing journey. In the savings phase, the highest-leverage decision is income and savings rate. In the returns phase, the highest-leverage decision is allocation discipline and avoiding behavioral mistakes that erode return. “Just keep buying” is the right rule for both phases, but the reasons it works are different in each.

The calculator below produces your own crossover year. Try the defaults first, then change the contribution and return assumptions to see how sensitive the crossover is to each.

Apply Selectively: Which Dollars Should “Keep Buying”?

The slogan loses precision when applied to every dollar in your household. A useful translation separates household money into buckets, each of which gets a different rule.

The bucket framework collapses most disagreements about Maggiulli’s advice. The post at the top of this guide’s comment thread is usually someone arguing that “just keep buying” doesn’t apply to their situation. Often they are right, and often the reason is that they are reasoning about a different bucket.

What the Rule Gets Right

• It fights the largest practical mistake. Most retail investors lose money not to bad allocation but to the behavior gap. Morningstar’s Mind the Gap 2024 report found a 1.1 percentage-point annual gap between investor returns and underlying fund returns over the 10 years to December 2023, attributable to the timing of purchases and sales. A rule that says “keep buying” is a rule that closes most of that gap.
• It aligns with long-run evidence on diversified equities. The UBS Global Investment Returns Yearbook 2026 reports that an initial $1 invested in equities in 1900 grew to $124,854 in nominal terms by end-2025, compared with $284 for long bonds and $69 for Treasury bills. The yearbook covers 21 countries with continuous histories. UBS Global Investment Returns Yearbook 2026.
• It is automation-friendly. “Keep buying” survives translation into a 401(k) deferral rate, a brokerage auto-deposit, an HSA contribution, and a backdoor or Mega Backdoor Roth funded once a year. The rule is built for set-and-forget execution, which is what most households actually need.
• It pairs with income growth. Maggiulli argues elsewhere that cutting expenses has a floor while income growth does not. For a household whose contributions will rise with raises, RSUs, or a career shift, the crossover year arrives sooner than the constant-contribution model suggests.

What It Oversimplifies

• Paycheck investing and windfall deployment are different decisions. Investing each paycheck deploys money as it becomes available. A $200,000 inheritance arriving tomorrow needs a separate answer about whether to invest it all on Monday or spread it over twelve months. Vanguard’s 2023 research found lump-sum investing beat dollar-cost averaging about two-thirds of the time, but the right answer for a specific investor depends on loss aversion. Summitward’s guide on Lump Sum vs. Dollar-Cost Averaging works through this case in detail.
• The rule is silent on asset allocation. “Keep buying” into a 100% S&P 500 portfolio is very different from “keep buying” into a globally diversified mix with bonds. UBS’s 2026 yearbook emphasizes that diversification has continued to reduce risk and drawdowns even as it has become harder. The slogan presumes you have already chosen what to keep buying.
• It is accumulation advice, not decumulation advice. Once you flip from net-saver to net-spender, the math changes. Sequence-of-returns risk, withdrawal strategy, RMDs, and tax-bracket management dominate, and “keep buying” becomes only one of several questions the household has to answer.
• It does not solve the no-surplus-cash problem. The Federal Reserve’s Survey of Consumer Finances found 58% of U.S. families had direct or indirect stock holdings in 2022, up from 53% in 2019, the largest three-year change on record. Federal Reserve: Changes in U.S. Family Finances 2019–2022. The 42% who do not participate are usually constrained by income, expenses, debt, or plan access, not by a missing investing rule.
• U.S. equity history is the favorable case. The intuition behind “keep buying” draws heavily on U.S. stock history, which has been one of the global winners. See Stocks Usually Win, but Usually Is Not a Plan for the regime-risk version of this question.

Who the Rule Is For (and Who It Isn’t)

“Just keep buying” is at its strongest for:

• High-income accumulators with stable surplus cash, a long horizon, and a tendency to overthink entry points.
• RSU-heavy tech workers who sell concentrated employer stock and need a disciplined reinvestment rule.
• Young investors funding 401(k), HSA, IRA, and taxable accounts who benefit most from automation.
• Anyone who has said “I will invest after the next correction.”

It is incomplete or actively misleading for:

• Households carrying high-interest debt or without an emergency fund.
• Households saving for a near-term goal (house, tuition, taxes) where the dollars cannot afford a 30% drawdown.
• Retirees and near-retirees in or approaching the decumulation phase.
• Investors with concentrated single-stock exposure who interpret “keep buying” as “keep buying my favorite company.”
• Anyone using leverage, options, crypto, or speculative assets where averaging down without a thesis can compound the original error.

Frequently Asked Questions

Is “Just Keep Buying” the same as DCA?

Roughly, but with a different emphasis. Dollar-cost averaging is a mechanical schedule of equal investments. Maggiulli’s slogan is a behavioral mantra meant to survive market stress, layered on top of DCA. The mantra is doing different work than the math. The math is mostly about getting your money into the market; the mantra is about not pulling it out when the market falls.

Should I “keep buying” during a recession?

For paycheck investing into a target allocation, yes. Stopping during downturns is exactly what creates the Morningstar return gap, and it tends to be the moment with the highest forward expected returns. Continuing to invest during 2008, 2020, and 2022 is the version of this rule that most consistently rewarded discipline.

Should I keep buying if I have a large lump sum?

That is a different question, covered in the Lump Sum vs. Dollar-Cost Averaging guide. The short answer is that investing the lump sum sooner usually beats spreading it over many months on average, but the spread can be the right choice for an investor who would otherwise hold all of it in cash.

What if I am holding cash, hoping for a dip?

Read The Problem With Buy the Dip. The empirical record on waiting for a better entry point is weak. The question to ask first is usually “why was this money not invested according to my target allocation already?”

Does the crossover happen for everyone eventually?

At reasonable contribution and return assumptions, most long-horizon accumulators reach a crossover within 15 to 25 years. It can take longer, or never happen within the planning horizon, if contributions grow rapidly while returns are modest. The calculator above shows your own situation. The crossover year is sensitive to contribution growth and to the real-return assumption; small changes in either move the year meaningfully.

Does “Just Keep Buying” apply to crypto or individual stocks?

Maggiulli’s definition was “income-producing assets,” which excludes most speculative positions and deliberately so. Applying the rule to a single stock turns it into averaging down, which research summarized in Most Stocks Lose to T-Bills suggests is the wrong default. For broad index funds and diversified portfolios the rule applies cleanly; for single stocks and speculative assets it does not.

Related Guides

• The Wealth Ladder is Maggiulli’s 2025 follow-up: a six-level framework for which planning problem dominates at each balance-sheet size, plus the 0.01% rule for marginal spending decisions.
• The Problem With Buy the Dip is the empirical companion to this post: AQR’s 196-rule test and Vanguard, Dimensional, PWL, and Morningstar evidence on the cost of waiting.
• Lump Sum vs. Dollar-Cost Averaging covers the windfall-deployment decision “just keep buying” does not address.
• Financial Independence Guide extends the savings-rate and accumulation framing to the full FI roadmap.
• The Order of Investing Operations covers where each savings dollar goes inside the wealth bucket.
• Safe Withdrawal Rate handles the decumulation half: what changes when “keep buying” flips to “keep spending.”

Key Takeaways

• “Just keep buying” is a behavioral mantra, not an asset-allocation strategy. It works because it survives stress and prevents the timing-driven mistakes that produce most of the investor-fund return gap.
• Maggiulli defined the rule as “continual purchase of a diverse set of income-producing assets.” Diversified, productive, and continual. The phrase does not endorse single-stock buying or crypto averaging.
• The savings-vs-returns crossover is the underused insight. For most accumulators, savings dominate growth for the first 15 to 20 years and returns dominate after that. The calculator above produces your specific year.
• Apply the rule selectively, by bucket. Long-term wealth dollars get the “keep buying” treatment. Emergency, near-term-goal, concentration, and decumulation buckets do not.
• The rule pairs with the rest of the plan. Income, savings rate, debt, allocation, taxes, and decumulation are all out of scope for “just keep buying” on its own. They are the rest of the plan.