Lessons

💰 Investing

Index funds, compounding, allocation. Build wealth on purpose.

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Why invest at all

Inflation nibbles while compounding snowballs. The case for putting money to work.

• The silent leakA mattress full of euros feels safe, because the notes never disappear. But prices creep up every year, so…
• The snowballCompound interest is often called the eighth wonder of the world (a line frequently attributed to Einstein…
• Time beats timingStudies of the US stock market over recent decades keep finding the same thing: missing just the 10 best days…
• Safety net firstBefore a single euro goes into the market, you need a cash cushion: an emergency fund covering roughly 3-6…
• Review: Why investInflation quietly shrinks idle cash: €10,000 can lose nearly half its buying power over 20 years. Compounding…

The instruments

Stocks, bonds, funds and cash: what you're really buying.

• Stocks: owning a sliceBuy one share of a company and you own a real slice of the business: a claim on its factories, brands and…
• Bonds: being the bankA bond turns you into the lender. You hand a government or company, say, €1,000; they promise regular interest…
• Funds: strength in numbersBuying hundreds of individual stocks yourself would cost a fortune in time and fees. A fund solves this…
• Cash & the restBeyond stocks, bonds and funds sits the supporting cast. Money market funds park cash in ultra-short-term debt…
• Review: The toolkitQuick tour of the toolkit: stocks make you a part-owner chasing growth. Bonds make you a lender collecting…

Index investing

Why buying the whole haystack beats hunting for the needle.

• What is an index?An index is simply a list of stocks with a running score. The S&P 500 tracks 500 of the largest US companies…
• Why beating the market is hardProfessional investing has an uncomfortable secret. Study after study finds that over long periods (10 to 15…
• Fees compound tooCompounding has an evil twin: fees compound too. A fund's TER (total expense ratio) is skimmed off every…
• The one-fund portfolioA single fund tracking a world index embarrasses many complicated portfolios. One purchase buys you a slice of…
• Review: Index powerThe unit in three beats: an index is a list with a score, like the S&P 500's 500 US giants or the MSCI World's…

Getting started

Brokers, orders, automation: from theory to your first standing plan.

• Choosing a brokerA broker is your gateway: the licensed firm that takes your orders to the exchange and holds your investments…
• Order basicsEvery broker app has the same two core buttons. A market order says 'buy now, at whatever the best current…
• Automate itThe best investing system is one that works while you forget about it. Pay yourself first: the moment salary…
• First-timer trapsEvery generation of new investors rediscovers the same four traps. Acting on hot stock tips: by the time a tip…
• Boss: Foundations of wealthInflation never touches the printed number; it hollows out what the number buys. Nearly half the real value…

What risk really is

Swings, crashes, and stomachs: telling temporary pain from permanent damage.

• Shaken vs brokenIn March 2020, global stocks dropped over 30% in a few weeks, then recovered within months. Terra's LUNA token…
• Living through −30%In 2008-09 the S&P 500 fell about 57% from its peak. €100,000 became roughly €43,000 on the statement. For…
• When the crash mattersTwo retirees earn the exact same average return over 25 years. Anna's crash comes in year 22; Ben's comes in…
• Wallet facts vs stomach factsRisk CAPACITY is about your money: how long until you need it, how stable your income is, whether you have an…
• Risk, reviewedOne: volatility is the ride shaking, permanent loss is the ride breaking. Two: recovery maths is cruel; lose…

Diversification

The only free lunch in investing, and the fine print nobody reads.

• The only free lunchImagine owning an ice-cream stand: sunny summers are great, rainy ones are ruin. Now add an umbrella shop…
• When everything falls togetherCorrelation measures how much two assets move together: +1 is lockstep, 0 is unrelated, −1 is mirror image…
• The Nokia lessonAround 2000, Nokia alone made up roughly 70% of the Helsinki stock exchange's value. Finns who 'invested at…
• DiworsificationLegendary fund manager Peter Lynch coined the word 'diworsification': adding holdings that add complexity, not…
• Diversification, reviewedDiversification cuts risk without a matching cut in expected return, but only across assets that don't move…

Bonds & the boring half

The see-saw of yields and prices, and the year 'safe' fell double digits.

• The yield see-sawA bond is a loan you make to a government or a company, in exchange for fixed interest payments (coupons) and…
• Duration: the see-saw's far endHow HARD a bond swings when rates move is called duration, measured in years. Think of the see-saw: a 2-year…
• 2022: the year 'safe' fellIn 2022, inflation surged and central banks jacked rates up from around zero at historic speed. Global bond…
• Who are you lending to?Rate moves aren't a bond's only risk. There's also the question of whether the borrower pays at all. Lending…
• Bonds, reviewedBonds are loans with price tags. Yields up, prices down: that's the see-saw. Duration says how hard the swing…

Costs & taxes

Fees, frictions, and tax drag: the leaks you can control.

• The fee icebergEvery fund publishes a TER (total expense ratio) like 0.2% or 1.8% a year. That's the tip of the iceberg…
• Fees compound tooYou know compounding works FOR you. Bad news: fees compound AGAINST you with the same relentless maths. A 1%…
• Tax drag basicsTaxes are a cost too, but unlike fund fees the rules are different in every country, so this lesson stays…
• Churning: activity as the enemyThat's the actual title of a famous study by Barber and Odean, who examined tens of thousands of brokerage…
• Boss: The risk gauntletVolatility is the ride shaking, not breaking. For a broad fund, the loss only becomes permanent at the moment…

Goals & horizons

Before you pick a single fund, decide what the money is FOR and when you'll need it.

• Three bucketsThink of your money as workers with different jobs. The emergency bucket (3-6 months of expenses) exists to…
• When NOT to investInvesting is powerful, but sometimes it's the wrong tool. Money you need within a couple of years shouldn't…
• Assets meet horizonsAssets have personalities. Cash and money-market funds are calm but barely grow. Bonds wobble a little and pay…
• Defining 'enough''I want to be comfortable someday' can't be planned. '€24,000 for a house deposit by July 2030' can. A real…
• Review: the mapMoney gets sorted into buckets by WHEN you need it. Emergency cash comes first, expensive debt dies second…

Asset allocation

The mix of stocks and bonds decides more than any hot pick ever will.

• Mix beats picksInvestors obsess over WHICH stock to buy. Research says the bigger question is how much goes to stocks versus…
• Classic recipesSome allocations are so battle-tested they have names. The 60/40: 60% stocks, 40% bonds, the classic balanced…
• The glide pathA 25-year-old and a 60-year-old shouldn't hold the same mix. Not because one is braver, but because one has 40…
• RebalancingSet a 60/40 mix and walk away, and the market quietly rewrites it. A strong stock year might leave you at…
• Review: the recipeThe mix across asset classes drives most of your outcome, far more than any single pick. Classic recipes like…

DCA & lump sums

How money gets INTO the plan: drip by drip, all at once, and through the storms.

• Paper vs personYou have €12,000 to invest. Invest it all today, or drip €1,000 a month for a year? Studies (including a…
• Automation as armorEvery manual investment is a fresh decision, and every fresh decision is a chance for fear, laziness, or a…
• Through the storm2008: the S&P 500 slid about 57% from peak to trough over 17 grinding months, and took roughly five years to…
• The windfall playbookAn inheritance, a bonus, a startup payout: sudden money short-circuits careful brains. Studies of lottery…
• Review: money in motionLump sums usually win on paper; DCA wins on behavior, and salary investing is DCA whether you name it or not…

Pensions & the long game

Matches, tax shelters, decades of compounding, and the enemy that never sleeps.

• Why pensions winA pension is mostly just an investment account wearing armor. Two superpowers show up in some form across many…
• The cost of waitingAt roughly 7% average annual growth, the rule of 72 says invested money doubles about every 10 years. Start at…
• The withdrawal ideaThe famous 4% rule of thumb: withdraw about 4% of your pot in year one of retirement, adjust for inflation…
• The 40-year enemyCrashes are loud; inflation is patient. At a modest 2.5% a year, prices roughly triple over 40 years, the span…
• Boss: The plannerThe order of operations: a starter cushion stops new debt, then the guaranteed 19% 'return' of clearing the…

The behavior gap

Funds do fine; their investors do worse. Close the gap between you and your own money.

• Worse than your own fundA fund can return 8% a year while the average person holding it earns only 6%. Same fund, same decade…
• Last year's winnerEvery January, 'best funds of the year' lists appear, and money floods into whatever topped them. But a fund…
• Fear, greed, headlinesMarkets swing between greed and fear, and headlines swing with them, just late. In 1979 BusinessWeek famously…
• The gap in eurosA 1-2% yearly gap sounds like rounding error. Compounded over a working life, it isn't. Remember the rule of…
• Review: mind the gapInvestors earn roughly 1-2%/yr less than their own funds by buying high and selling low. Performance chasing…

Market history

A century of crashes, recoveries and expensive lessons. Read before repeating.

• Crashes & recoveries1929: the Dow lost roughly 89% and needed decades to reclaim its peak. 1987: -22.6% in a single day, new highs…
• The graveyard you can't seeOf the 12 companies in the original 1896 Dow index, none remain; General Electric, the last, was removed in…
• This time is differentSir John Templeton called 'this time it's different' the four most expensive words in investing. Dutch tulips…
• What returns really wereOver roughly 125 years of data (Dimson, Marsh & Staunton), world equities returned about 5% a year AFTER…
• Review: history's homeworkEvery broad-index crash so far has been followed by recovery, from months (2020) to decades (1929). The…

Factors & beyond the index

Value, momentum, the factor zoo, and the marketing machine built on top.

• The big four factorsDecades of research found that certain SLICES of the market have historically returned more than the market…
• The factor zooResearchers have published hundreds of market-beating 'factors'; economists call it the factor zoo. The trick…
• When active can winLet's be fair to the other side. Active management is most plausible where markets are least picked-over: tiny…
• Smart beta, decoded'Smart beta' is the fund industry's name for factor investing in an ETF wrapper: rules-based tilts toward…
• Review: the factor jungleValue, momentum, quality and size are the four factors with real evidence, paid for with long stretches of…

Staying the course

Rules for storms, rituals for calm: how graduates behave for decades.

• Write the rules before the stormPilots don't improvise emergencies; they open a checklist written on a calm day. An Investment Policy…
• The annual review ritualA serious portfolio needs about one hour of attention per year. Check four things: has your allocation drifted…
• When life changes the planMarkets crashing is never a reason to change your plan; your LIFE changing is the only good one. Marriage…
• The one-page synthesisHere it is, graduate. Inflation melts idle cash; compounding builds patient wealth. Own the world through…
• Boss: The investorThe haystack, on autopilot, with a yearly ritual. Waiting in cash means inflation plus missed compounding…