In our words, with a link to where each investor sets the idea out in their own.
Mr Market
Picture the market as an excitable business partner who offers a new price every day. You can ignore his moods and only deal with him when his price is clearly too high or too low.
Benjamin GrahamThe Intelligent Investor, chapter 8 ('The Investor and Market Fluctuations')
Margin of safety
Pay well below your estimate of a business's value so that errors, bad luck or an unknowable future still leave you protected.
Benjamin GrahamThe Intelligent Investor, chapter 20 ('Margin of Safety as the Central Concept of Investment')
Judge a share as you would a farm
Value an investment by what the underlying asset will produce over time, not by recent price moves or macro forecasts, and treat market panics as chances to buy.
Warren BuffettBerkshire Hathaway 2013 shareholder letter, 'Some Thoughts About Investing'
Wonderful businesses at fair prices
Munger persuaded Buffett to move on from buying mediocre businesses because they were cheap, and to pay a sensible price for excellent ones instead.
Warren Buffett / Charlie MungerBerkshire Hathaway 2014 shareholder letter, 'Charlie Straightens Me Out'
Circle of competence
What matters is not how large your area of understanding is but knowing where its edges are, and declining anything outside it however popular it becomes.
Warren BuffettBerkshire Hathaway 1999 shareholder letter, 'Investments'
Great, good and gruesome businesses
The best businesses have a durable moat and need little extra capital to grow; the worst grow fast while consuming capital and earning little.
Warren BuffettBerkshire Hathaway 2007 shareholder letter
Intrinsic value and owner-partners
A business is worth the discounted cash it can hand out over its remaining life, and shareholders should think of themselves as part-owners holding for the long term.
Warren BuffettBerkshire Hathaway Owner's Manual
Index funds for most investors
For people who are not professionals, a low-cost index fund will beat most fee-heavy active managers over time, as his ten-year bet against hedge funds showed.
Warren BuffettBerkshire Hathaway 2016 shareholder letter
Inversion
Hard problems often become easier when turned around: work out what would guarantee failure, then avoid it.
Charlie MungerHarvard School commencement address, 13 June 1986 ('How to Guarantee a Life of Misery')
The psychology of misjudgement
Predictable mental tendencies, such as reacting to incentives or following the crowd, lead sensible people into poor decisions, so a decision-maker needs a checklist of them.
Charlie Munger'The Psychology of Human Misjudgment', Harvard, 1995
Second-level thinking
To outperform you must think differently from the consensus and be right, weighing what is already expected and priced in rather than simply forming a view on the future.
Howard MarksOaktree memo 'I Beg to Differ' (26 July 2022), drawing on The Most Important Thing
The pendulum of investor psychology
Market sentiment swings between euphoria and despair and seldom rests at a sensible midpoint; each extreme sows the seeds of the swing back.
Howard MarksOaktree memo 'The Happy Medium' (20 July 2004)
Avoid loss first
Protecting capital comes before chasing returns; insist on a sizeable discount, judge results in absolute terms and be content to hold cash when nothing is cheap enough.
Seth KlarmanMargin of Safety (1991)
Buy good companies, don't overpay, do nothing
Own businesses that earn high returns on capital from repeat demand, buy only at sensible valuations, and then trade as little as possible.
Terry SmithFundsmith Owner's Manual
Heads I win, tails I don't lose much
Look for bets where the downside is small and the upside is large, as when Patel families bought motels with modest capital and limited risk.
Mohnish PabraiThe Dhandho Investor, chapter 1
Scuttlebutt
Learn about a company by talking to its competitors, suppliers, customers and former staff; the outstanding businesses stand out once you do.
Philip FisherCommon Stocks and Uncommon Profits (1958)
Shares are part-ownership of a business
Treat a share as a stake in a real company, buy with a margin of safety, ignore Mr Market except at extremes, and stay within a small circle of competence built through long study.
Li Lu'The Practice of Value Investing', Peking University Guanghua School of Management, 29 November 2019
The three-legged stool
Look for an exceptional business, run by able managers, with a record of reinvesting profits at high returns; if one leg weakens, consider selling.
Chuck AkreAkre Capital Management, 'Our Investment Philosophy'
The rule of three
Accept that roughly one year in three the portfolio will lag its index and roughly one purchase in three will disappoint, and judge results over five years or more.
François RochonGiverny Capital annual letter 2013
Durable franchises held for decades
Own a concentrated set of established, cash-generative businesses with pricing power or valuable intellectual property, and keep turnover very low.
Nick Train (Lindsell Train)Lindsell Train, 'Our Investment Approach'
Growth without free cash is not value
Risk means permanent loss rather than price swings, and growth only adds value when it produces free cash returns above the cost of capital.
Chris BloomstranSemper Augustus, 'Investment Philosophy'