Market Mental Models
How Probability Surfaces Differ From Static Price Targets
A surface shows an event and horizon for each estimate. It can explain uncertainty more clearly without proving that the model is accurate.
Wiki learning path
Market Basics and Investing
Start with investing fundamentals, financial news, market psychology and practical mental models for interpreting prices.
56 guides. Start with the introductory topics; follow related links inside each guide.
Market Mental Models
Bayesian Updating in Financial Probability Analysis
Most bad forecasting is not bad arithmetic. It is starting from the wrong base rate, or over-reacting to evidence that was not very diagnostic.
Market Mental Models
Understanding Tail Risk and the 95% Confidence Band
A 95% band does not mean the other 5% is impossible. It means you should expect to be outside it roughly one day in twenty — and in real markets, rather more often than that.
Market Basics
What Moves Markets?
Prices rarely move because of what happened. They move because of how what happened compares to what everyone already expected.
Market Basics
Why Markets Rise on Bad News
A weak jobs report or a soft earnings quarter can send stocks higher — not because bad news is good, but because it changes what happens next.
Market Basics
Why Good News Can Crash Stocks
Beating expectations isn't the same as beating what the price already assumed. When good news was already assumed, the trade is done before the headline even prints.
Market Basics
What Is Market Sentiment?
Sentiment isn't a forecast — it's the mood investors are trading with right now, and it can be measured even when nobody can agree on where prices go next.
Market Basics
Market Psychology
Markets are made of people, and people run on the same emotional cycle — hope, greed, panic, and capitulation — in bubble after bubble, crash after crash.
Market Basics
Risk-On vs Risk-Off
When confidence rises, money flows toward growth and yield. When uncertainty spikes, it flows back toward safety — and you can watch that rotation happen in real time.
Market Basics
Why Correlations Change
The relationship between two assets is a snapshot of current market conditions, not a permanent law — and when conditions shift, so does the correlation.
Reading the News
How to Read Financial Headlines
Professionals skip the headline and go straight to the numbers underneath it — because the headline rarely tells you whether the market actually liked what it saw.
Reading the News
Why the First Headline Is Usually Wrong
Markets don't process news all at once. They digest it in stages — and the first headline is only the opening line of a much longer story.
Reading the News
Breaking News vs Market News
Not every headline that grabs attention actually moves valuations — and not every story that moves valuations makes for an exciting headline.
Reading the News
Signal vs Noise
Markets generate far more information than any one person can use — most of it noise, and a much smaller share of it genuine signal worth paying attention to.
Market Frameworks
Market Frameworks
The mental models professional investors actually use to interpret markets — not facts to memorize, but ways of thinking that stay useful no matter what's in the headlines.
Investing Basics
Diversification Explained
Spreading money across assets that don't move in lockstep is the closest thing investing has to a free lunch. It has real limits, though, and knowing where they sit matters.
Investing Basics
Dollar Cost Averaging Explained
Investing a fixed amount on a set schedule, regardless of price, trades the chance of perfect timing for a simpler and more disciplined way to build a position.
Investing Basics
Compound Returns Explained
Returns that earn returns on themselves grow slowly at first and dramatically later — which is exactly why time in the market tends to matter more than most people expect.
Investing Basics
Risk vs Reward Explained
Every investment decision is ultimately a tradeoff between how much you could gain and how much you could lose. Understanding that tradeoff is the starting point for building any strategy.
Investing Basics
What Is Beta?
Beta measures how much a stock tends to swing relative to the broader market — a shorthand for how much extra volatility an investor is signing up for.
Investing Basics
What Is Alpha?
Alpha is the return an investment generates above and beyond what its risk level would predict — the elusive edge every active manager claims to have and few consistently deliver.
Investing Basics
Sharpe Ratio Explained
The Sharpe ratio measures return earned per unit of risk taken, turning a raw performance number into a way to compare how efficiently different investments generated that return.
Investing Basics
Drawdowns Explained
A drawdown is the decline from a peak to a subsequent trough — and because losses and the gains needed to recover from them aren't symmetric, drawdowns matter more than they might first appear.
Investing Basics
Market Capitalization Explained
Market cap — share price multiplied by shares outstanding — is how the market prices an entire company, and it isn't the same thing as how big that company actually is.
Investing Basics
Growth vs Value Stocks
Growth investors pay up for expected future earnings; value investors look for businesses trading cheaply relative to what they already produce. Both styles fall in and out of favor with the economic cycle.
Investing Basics
Dividend Stocks Explained
Dividends are a company's way of sharing profits directly with shareholders — and understanding yield, payout ratio, and total return is key to seeing what that actually means for an investor.
Investing Basics
Share Buybacks Explained
When a company repurchases its own shares, it's shrinking the pool of stock outstanding — a move with real effects on per-share metrics, and real debate over whether it's the best use of corporate cash.
Investing Basics
Stock Splits Explained
A stock split changes how many shares represent a company and at what price — but not the value of the company itself. Here's what actually changes, and what doesn't.
Investing Basics
IPOs Explained
An initial public offering is how a private company first sells shares to the public — a process involving underwriters, pricing decisions, and a lockup period, all before the stock trades freely.
Investing Basics
SPACs Explained
A Special Purpose Acquisition Company offers a private business a faster route to public markets than a traditional IPO — with a different set of incentives and risks attached.
Market Psychology
Why Markets Ignore Big News
Some headlines dominate the news cycle for days and move a stock or index by almost nothing. That's not the market being asleep — it's the market telling you something.
Market Psychology
Why Small News Can Move Markets
A minor data revision or a single throwaway line in a transcript can do more damage than a headline that dominated the week. Size and impact are not the same thing.
Market Psychology
Market Expectations Explained
Every price on a screen is a bet on the future. Understanding how that bet gets formed — and constantly revised — is the foundation for reading any market reaction.
Market Psychology
Consensus vs Surprise in Markets
It's not whether earnings grew or inflation cooled that decides the price reaction. It's whether the number matched what everyone already expected.
Market Psychology
What does “priced in” mean in markets?
Understand what priced in means, why markets react to surprises rather than expected news, and how the phrase can be misused.
Market Psychology
Narrative Shifts in Markets
The same economic data can be read as good news one quarter and bad news the next. The difference isn't the data — it's which story the market is currently telling itself.
Market Psychology
Why Price Matters More Than Opinions
Every analyst, strategist, and pundit has a view. Price is the only thing that reflects what every one of them actually did with their capital.
Market Psychology
Why Analysts Disagree
Ten analysts, ten price targets, sometimes a wide spread between the lowest and highest. That's not confusion — it's what honest uncertainty looks like.
Market Psychology
How Markets Discount the Future
A stock price today is a bet on cash flows years from now, discounted back to the present. That single mechanic explains some of the market's strangest-looking behavior.
Market Psychology
News vs Price Action
Sometimes the headline says one thing and the chart says another. When they disagree, the chart is usually telling you something the headline can't.
Market Psychology
When Markets Stop Caring
A risk that once moved every asset on every headline can, eventually, stop registering at all. Recognizing that shift matters as much as recognizing the risk itself.
Market Mental Models
Expectations vs Reality in Markets
Stocks don't move on good news or bad news. They move on the gap between what everyone expected and what actually showed up.
Market Mental Models
Reflexivity in Markets
George Soros's idea that markets don't just reflect reality — they can reshape it, in a loop where perception and fundamentals feed each other.
Market Mental Models
Second-Order Thinking
The obvious conclusion is usually already in the price. The edge lives one step further — in what happens next, and how everyone else reacts.
Market Mental Models
Market Regimes Explained
The same data point can mean opposite things depending on the environment it lands in. Knowing which regime you're in matters more than any single indicator.
Market Mental Models
Liquidity Cycles Explained
Asset prices respond to how much money and credit is available in the system, not just to earnings and growth — and that supply expands and contracts in cycles set largely by central banks.
Market Mental Models
Narrative Investing
Stories move capital as powerfully as spreadsheets do. Understanding how a narrative forms, spreads, and eventually breaks is its own kind of market literacy.
Market Mental Models
Positioning Before Fundamentals
Who already owns an asset can matter more for the next move than whether the investment case is sound. Crowded trades react to their own weight, not just the news.
Market Mental Models
The Discounting Mechanism
Markets don't price what a business earns today — they price everything it's expected to earn, discounted back to the present. That single idea explains why prices move before the news does.
Market Mental Models
Wall of Worry Explained
Markets have a habit of climbing even when the headlines are relentlessly negative. That's not a bug — it's what happens when the worry is already priced in.
Market Mental Models
Reflexive Feedback Loops
Rising prices attract more buyers, which pushes prices higher still. The mechanics of that loop, and its mirror image on the way down, explain how booms and busts overshoot.
Market Mental Models
Convexity in Finance: Bonds, Options and Risk
Understand convexity in bonds and options, why gains and losses can respond asymmetrically, and the costs of maintaining convex exposure.
Market Mental Models
Fat Tails Explained
Extreme market moves happen far more often than a bell curve says they should. That gap between the model and reality is what 'fat tails' actually means.
Market Mental Models
Mean Reversion Explained
Prices and valuations tend to snap back toward their long-run average after stretching too far in either direction, until, in some cases, they don't.
Market Mental Models
Momentum Explained
Trends tend to keep going longer than fundamentals alone can justify. Momentum is one of the most persistent, well-documented patterns in markets, and one of the hardest to explain cleanly.
Market Mental Models
Antifragility in Markets
Some systems break under stress. Some merely survive it. Nassim Taleb's idea of antifragility describes a rarer third category: things that actually get stronger from disorder.