Interactive module

Vickrey Auction

Bid for the best room, win with the highest bid, pay the second price.

Rule ledger

caseThree roommates submit sealed bids for the most desirable bedroom.

rulewinner = argmax bid_i, payment = second-highest bid

questionWhen one strategy changes alone, whose payoff or fairness changes first?

Second-Price Room Auction

Room bidsArt auctionsAd slots

Ava$720

Ben$640

second price

Chloe$580

Ava bid$720Ben bid$640Chloe bid$580

Winner

Ava

Pays second-highest bid

$640

How to read this result

The highest bid decides who wins, but the payment is the second price. That is why bidding your true value is safer than trying to guess everyone else.

Formula

winner = argmax bid_i, payment = second-highest bid

Your bid decides whether you win, but not the price you pay once you win.

Step-by-step Explanation

Scenario

Three roommates submit sealed bids for the most desirable bedroom.

Why This Matters

Second-price auctions power truthful bidding ideas used in ad markets and marketplaces.

Beginner-Friendly Summary

Truth-telling is attractive because shading your bid mostly risks losing items you truly value.

Try changing the strategy and watch which result changes first.