Prediction market: Who will be the Democratic Nominee?
Each contract pays off $1 if the event occurs, e.g., Joe Biden wins the Democratic Nomination. The price of the contract can be interpreted as the probability of the event, Price=probability*$1. For example, the Joe Biden contract is trading at $0.39 suggests a 39% that he will win the nomination.
These kinds of prediction markets can be used by firms to, e.g., predict future sales or profitability.