Final Exam: Trading the Crowd

This is the trading desk, and the crowd is your counterparty. Five lessons handed you the full prediction-market toolkit — how an outcome share pays $1 or$0 so its price reads as a probability, how USDC on Polygon settles the bets and $1 complete sets mint and merge, how a central limit order book fills you and slippage punishes size, how UMA’s optimistic oracle decides what actually happened, how calibration and the favorite–longshot bias reveal where prices lie, and how arbitrage and Kelly sizing turn an edge into a position. Now you trade without a net. No formula sheet, no hints, no second guesses: every answer locks the instant you submit it, and every wrong option is a misconception that has cost a real trader real money. Read all four choices, twice, before you commit.

Whatever the score reads, the toolkit you just stress-tested — outcome shares whose price is a probability, the USDC-on-Polygon plumbing and $1 sets you mint and merge, the order book and the slippage it inflicts, the UMA optimistic oracle that decides what happened, the calibration and biases that reveal mispricing, and the arbitrage and Kelly sizing that turn an edge into a position — is exactly what a sharp prediction-market trader watches on every bet. Here is the whole course in one glance.