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A Family Book on Money

Still Water

Be the Master of Your Money — Slow Is Fast, Simple Is Good

My method: every month, I invest what I've saved at regular intervals in passive, broad-market index ETFs, hold for the long run and don't sell at the highs; when markets crash, I add more from new income.
It is what remained after I tested and revised my approach against historical data from the US, Japan and Taiwan; the results differ by country (see Chapter V).

9chapters40ideas14investors13data stories429connections

The Whole Book at a Glance

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The Method

The Whole Method in One Sentence

Save every month, invest at regular intervals in passive, broad-market index ETFs, hold for the long run and never sell at the highs — and when markets crash, add more from new income.

1 · Capital
¼Pay yourself first: when you're starting out, aim to save a quarter of what you earn.Chapter II
2 · Don't guess the bottom
> 70%Even knowing every bottom in advance, waiting for dips lost to regular investing more than 70% of the time.Nick Maggiulli, Just Keep Buying · Chapter V
3 · Own the whole market
~90%Over 15 years, about nine in ten US large-cap active funds trailed the S&P 500.SPIVA 2025 · Chapter III
4 · Don't sell at the highs
−31% to −97%"Sell when it's expensive, buy back when it falls" left investors poorer in long-run backtests for the US, Japan and Taiwan.Author's backtests · Chapter V
5 · Add in crashes
US +20%
Japan −11 to −15%
Doubling contributions from new income in months when stocks were down 20% or more: about 20% more per dollar in the US and about 10% more in Taiwan, but 11–15% less in Japan.Author's backtests · Chapter V

Data Lab · Real historical data

The DCA Time Machine

Pick a year and a market, and see what would have happened if you had started investing every month back then. All real historical data — no assumed returns.

ValueInvestedWorst market fall
See the Numbers by Year (Table)

More Experiments in the Data Lab →

Market Thermometer · Monthly data, checked for updates every week

Market Temperature

Each thermometer shows where today's reading ranks in its own history. It describes a position in history, not a buy or sell signal.

Bull or Bear? All the Thermometers Together

Bear
Bull

All of the above are actual past figures. They do not predict the future and are not investment advice or a buy or sell signal.

See the Bull–Bear Temperature and Its History →

184%US valuation94th percentileVery hot
255%US market cap ÷ GDP91st percentileVery hot
-0.79Financial stress8th percentileVery calm
271%Taiwan valuation99th percentileVery hot
482%Taiwan market cap ÷ GDP100th percentileVery hot
NT$758.9 billionTaiwan margin debt96th percentileVery hot
ColdHotUpdated 2026-10-14 · Percentile = where today's reading sits in its own history

See All Indicators and Long-Term Trends →


The Investors in This Book

This book stands on their shoulders. Their quarterly public holdings filings are on our sister site, On the Shoulders of Value Giants (for research, not as recommendations).

Benjamin Graham

Father of value investing: Mr. Market and the margin of safety.

See Connections on the Map →

Warren Buffett

The voice of compounding and long-term holding; his ten-year bet saw an index fund beat hedge funds.

Public holdings filings (research, not a recommendation) →

John Bogle

Father of the index fund: buy the whole haystack, and the lower the cost the better.

See Connections on the Map →

André Kostolany

The egg theory and the man walking his dog: reading human nature and market cycles.

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Howard Marks

The pendulum of emotion, and defensive investing.

Public holdings filings (research, not a recommendation) →

Peter Lynch

The cocktail-party theory; a bear market is like a winter blizzard — it passes.

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Philip Fisher

Father of growth investing: if you did your homework, the time to sell is almost never.

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Charlie Munger

Buffett's longtime partner; the book draws on his views on compounding, patience and lifelong learning.

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