The Philosophy of Technical Analysis
The three premises technical analysis rests on, and how it differs in kind — not just in method — from fundamental analysis.
Murphy opens by stating technical analysis as a discipline built on three premises, and the whole rest of the book is really an extended argument for why each one holds up: market action discounts everything, meaning every factor that could possibly affect a price — economic, political, psychological — is already reflected in that price, so studying the price itself is sufficient; prices move in trends, meaning price action is not random but tends to continue in an established direction until something demonstrably changes it; and history repeats itself, meaning chart patterns that worked in the past keep recurring because they reflect persistent, largely unchanging aspects of human psychology under uncertainty — fear, greed, hope, and herd behavior look the same in a 1929 chart as a 1999 one.
This is presented as fundamentally different from fundamental analysis, not just a competing method for reaching the same kind of answer. A fundamental analyst asks what a security is worth and trades the gap between price and that estimated value; a technical analyst asks what the price is actually doing and trades the continuation or reversal of that behavior, treating the "why" — earnings, macro data, news — as already priced in and therefore not worth separately researching. Neither claim is that the other approach is wrong; Murphy is explicit that many successful traders blend both, but the book itself is a sustained, single-discipline case for what price action alone can tell a trader.
| Question asked | Technical analysis | Fundamental analysis |
|---|---|---|
| What matters | Price and volume history | Earnings, macro data, industry conditions |
| What is being forecast | Price direction | Intrinsic value |
| Timing | Central to the method | Often deliberately de-emphasized |
| Underlying assumption | Price already reflects all known information | Price can diverge from true value |
The weakest-sounding of the three premises on first read is "history repeats itself" — it sounds like it is claiming markets are literally deterministic. Murphy's actual argument is narrower and more defensible: it is not the specific price levels that repeat, but the recognizable shapes that collective fear and greed produce under similar conditions, because human psychology facing uncertainty, profit, and loss has not meaningfully changed. A double top forms the same way whether it is a 19th-century commodity or a modern equity index, because it reflects the same underlying behavior: buyers failing a second time to push through a level that already rejected them once, and that failure itself changing sentiment.
- Technical analysis rests on three premises: market action discounts everything, prices move in trends, and history repeats itself.
- It is a different kind of analysis from fundamental research, not just a different method for the same question — it deliberately treats the "why" behind a price move as already priced in.
- "History repeats" is a claim about recurring, psychology-driven chart shapes, not a claim that specific price levels or outcomes are predetermined.