Quick definition Price discovery is the process by which market prices incorporate information and converge to the true economic value of a security. Trading reveals information; prices adjust in response. What it is Price discovery happens when traders submit orders based on their beliefs about value. If a trader believes a stock is worth 100 dollars and the current price is 95 dollars, they buy. This buying pressure moves the price up. If many traders share this belief, the price converges toward 100 dollars. Price discovery is imperfect. Prices sometimes overshoot or undershoot true value. Bubbles and crashes occur when many traders share incorrect beliefs. Over time, price discovery corrects these errors as new information arrives. Why it matters Price discovery is the fundamental purpose of financial markets. Without price discovery, capital allocation would be impossible. Market prices guide investment decisions; if prices are wrong, capital goes to the wrong places. Market structure affects price discovery quality. Venues with deep liquidity and many participants typically have better price discovery than thin venues. Price discovery versus price efficiency Price discovery is the process of finding the right price. Price efficiency is the idea that prices already reflect all available information. These are related but distinct; markets that discover prices efficiently are typically more efficient. Practical example A biotech company is running a trial for a new drug. Insiders believe the drug will be approved. They buy shares, pushing the price from 50 dollars to 75 dollars. The market interprets this buying pressure as a signal of good news and prices adjust toward 75 dollars. When the approval is announced, the price moves to 95 dollars. The market had partially discovered the news through the insiders' buying pressure, but not fully. The price discovery process continued until the official announcement. Informed trading and price discovery Informed traders accelerate price discovery. If a trader has better information than the market, their trades push prices toward true value. This is socially beneficial, though some regulations restrict informed trading (insider trading rules). See also - Market Efficiency - Information Asymmetry - Price Formation - Insider Trading
