whatSomewhere there is a true value, drifting as a slow random walk, and nobody knows it. Traders arrive thirty a second with zero intelligence: flip a coin for buy or sell, shout a price equal to their own noisy guess, off by up to five ticks. The only institution is a matching engine: a shout that crosses the best resting price trades; otherwise it rests in the book and goes stale in seconds. The book stands at the right as depth strokes with the spread as the white gap; trades scroll left as ticks; the dashed line is the truth, disclosed only to you.

whyThe claim, from Gode and Sunder: the market is smarter than anyone in it. Measured here, the tape of trades misses the hidden value by about one tick while every individual trader misses by two and a half -- discovery from pure noise plus bookkeeping -- and a stable bid-ask spread of about two ticks opens on its own, deep below, deep above, thin in the middle, like a real exchange. Click to send a whale fifteen deep: the price gouges several ticks and the book heals it within seconds. Impact and resilience emerge unasked as well.

howZero-intelligence limit orders on a half-tick grid, uniform noise, seven-second expiry, full price-time matching against the best opposite quote. No trader remembers, learns, or strategizes. One integer seeds the value's walk and every shout, so the same seed trades the same tape.