Building wealth over time is less about picking the right stock at the right moment and more about the practices investors maintain consistently , through bull markets, downturns, and everything in between. A growing body of institutional research from 2024 and 2025 points to a clear pattern: investor behavior is frequently the primary driver of long-term outcomes, not market conditions alone.
Here is what the evidence reveals about the habits that tend to distinguish investors who build lasting wealth from those who fall short of their own potential.
The Behavior Gap Is Larger Than Most Investors Realize
Before examining specific habits, it helps to understand the scale of the problem that disciplined habits are meant to solve.
Morningstar’s 2024 “Mind the Gap” study , tracking U.S. mutual funds and ETFs over the 10 years ended December 31, 2024 , found that the average dollar invested earned 7.0% annually, while the underlying funds returned 8.2% annually over the same period. That 1.2 percentage point annual gap, driven primarily by poorly timed trades and cash-flow decisions, represents a persistent drag that Morningstar compares in magnitude to fund expense ratios (Morningstar, “Volatility Bedevils Fund Investors,” morningstar.com, as of December 31, 2024).
DALBAR’s Quantitative Analysis of Investor Behavior (QAIB 2024) reinforces this finding: in 2024, the average equity investor returned 16.54% while the S&P 500 returned 25.02% , an underperformance gap of 8.48 percentage points in a single calendar year, which DALBAR described as the second-largest such gap in the past decade (DALBAR, QAIB 2024, as summarized in Kirrmar analysis, kirrmar.com, October 2025).
These are not abstract statistics. They represent real dollars that investors forfeited , not because markets failed them, but because behavior did.
Habit 1: Staying Invested Through Volatility
One of the most well-documented findings in behavioral finance concerns the cost of exiting the market during turbulent periods. J.P. Morgan Asset Management’s Guide to the Markets has consistently shown that missing just the 10 best trading days over a 20-year S&P 500 window roughly halves the annualized return compared to staying fully invested , and that the best days frequently cluster near the worst days in market history (J.P. Morgan Asset Management, Guide to the Markets, 2024 edition, data through December 31, 2023).
The SEC’s Investor.gov frames this principle directly: “Remind yourself that it’s time in the market that counts, not timing the market” (SEC Investor.gov, “Top 10 New Year’s Investing Resolutions,” investor.gov).
Fidelity’s 2025 “State of the American Investor” survey , conducted April 15–24, 2025, among 2,007 U.S. adults , found that 69% of tenured investors (those with more than 10 years of experience) say volatility is to be expected, compared with 46% of newer investors. The gap in perspective between experienced and newer investors suggests that staying invested through multiple cycles may itself build the tolerance that supports further discipline (Fidelity, “State of the American Investor,” newsroom.fidelity.com, August 19, 2025).
Habit 2: Investing Regularly and Systematically
Consistent, periodic contributions , regardless of market conditions , reduce the behavioral risk of trying to time entry points. This approach, often associated with dollar-cost averaging, means an investor accumulates more shares when prices are lower and fewer when prices are higher, without requiring a forecast about either.
The SEC’s guidance on long-term investing emphasizes building a plan that includes regular contributions as a structural feature, rather than relying on discretionary decisions about when to invest (SEC Investor.gov, Investor Bulletins - General Resources, investor.gov, as of 2025).
Morningstar’s 2024 “Mind the Gap” findings add a further dimension: funds with more stable investor cash flows , a proxy for more consistent, less reactive contribution behavior , showed investor return gaps of approximately 0.8% per year, roughly 1 percentage point narrower than the gaps seen in funds with the most volatile cash flows (Morningstar, “Volatility Bedevils Fund Investors,” morningstar.com, as of December 31, 2024). The data suggest that consistency of behavior, not just consistency of presence, matters.
Habit 3: Diversifying Across Assets and Geographies
Concentration risk , holding too much in a single stock, sector, or market , amplifies the behavioral pressure to react when that concentrated position moves sharply. Broad diversification across asset classes, sectors, and geographies may reduce that pressure by limiting the impact of any single adverse move.
The SEC explicitly advises investors to build “a portfolio of diverse assets” as part of a long-term plan, noting that such a portfolio “will better prepare you for inevitable market changes” (SEC Investor.gov, Saving and Investing, investor.gov, as of 2025). Standard disclosure applies: diversification reduces risk but does not eliminate it, and does not ensure a profit or protect against loss in declining markets.
A 2025 SSRN working paper titled “Beyond Alpha” identified investor behavior , not fund selection , as the primary factor driving long-term wealth performance, reinforcing the view that structural portfolio design may matter more than security selection for most investors (SSRN, “Beyond Alpha,” papers.ssrn.com, 2025).
Habit 4: Keeping Costs in View
Fees and expenses reduce net returns compounding over time. A 2025 analysis by Index Fund Advisors, synthesizing S&P Dow Jones SPIVA data and Morningstar’s Active/Passive Barometer, found that only 21% of active funds both survived and outperformed their passive peers over the 10-year period ending June 30, 2025. For U.S. large-cap funds specifically, the figure was 8% over the same period (IFA, “From Hot Hand to Cold Reality,” ifa.com, 2025).
Morningstar’s own framing is instructive: the behavior gap of 1.2% per year is “a rather persistent cost, not unlike fund expense ratios” , meaning investors may effectively be paying twice: once in product fees and again in poorly timed decisions (Morningstar, “Volatility Bedevils Fund Investors,” morningstar.com, as of December 31, 2024).
The SEC reinforces this through Investor.gov, noting that “fees and expenses can significantly reduce your investment returns over time” and encouraging investors to understand all account-level and product-level costs before investing (SEC Investor.gov, Investor Bulletins - General Resources, investor.gov, as of 2025).
Habit 5: Using a Written Plan as an Anchor
A written investment plan , one that defines goals, time horizon, and a framework for decision-making , may help investors resist reactive choices during market stress. Survey data compiled by Ulin Wealth from multiple institutional sources, including Charles Schwab’s 2023 Modern Wealth Survey, found that 66% of Americans lack a written financial plan, leaving them more exposed to ad-hoc decisions during periods of volatility (Ulin Wealth, “40 Money and Investing Stats,” ulinwealth.com, 2024–2025, citing Charles Schwab, Modern Wealth Survey, 2023).
The SEC’s guidance connects planning directly to long-term outcomes: “The most successful way to invest for a strong financial future is to create a saving and investing plan for the long term” , one that reflects long-term goals and risk tolerance, and prepares investors for market changes rather than prompting reactions to them (SEC Investor.gov, Saving and Investing, investor.gov, as of 2025).
Vanguard’s Advisor’s Alpha framework estimates that behavioral coaching , helping investors maintain their plan during volatility rather than abandoning it , may add approximately 2% in net returns per year, out of a total estimated 3% annual value attributable to planning, rebalancing, cost control, and asset allocation guidance (Vanguard, “Putting a Value on Your Value: Quantifying Vanguard Advisor’s Alpha,” Vanguard Research, 2023). Individual circumstances vary, and these figures are illustrative rather than guaranteed outcomes.
Habit 6: Calibrating Expectations to the Long Term
Newer investors, according to Fidelity’s 2025 survey, are five times more likely than seasoned investors to plan to start using margin and options over the next 12 months. Over one-third of newer investors report making most investment decisions based on social media, versus approximately one in ten experienced investors (Fidelity, “State of the American Investor,” newsroom.fidelity.com, August 19, 2025).
Experienced investors tend to orient differently. Fidelity found that tenured investors are more likely to prioritize limiting losses and seeking more stable investments , a posture more consistent with the long-term, diversified approach the research consistently associates with stronger realized outcomes.
This does not mean newer investors cannot develop these habits. The data suggest they can be learned , and the learning curve appears to involve recalibrating toward patience, process, and a longer time horizon.
Putting the Habits Together
The research from Morningstar, DALBAR, Fidelity, J.P. Morgan, Vanguard, and the SEC converges on a consistent picture: the investors most likely to realize the returns that markets make available are those who stay invested, contribute regularly, diversify broadly, keep costs in view, and operate from a written plan rather than from market sentiment.
None of these habits require predicting the future. They require building systems that reduce the influence of short-term emotion on long-term decisions , and maintaining those systems through the inevitable periods of uncertainty.
Evaluate your own approach in light of your personal circumstances, goals, and risk tolerance. Consider speaking with a qualified financial advisor to assess whether your current habits align with your long-term objectives.
Explore resources for the next generation of investors at siebert.com/genw.