Why this site uses odds from Betfair.com
This site's odds are entirely from the site Betfair.com. After Intrade.com was shut down, Betfair became the only prediction market in the world that has a lot of trading and is efficient. It is based in the U.K., where regulations are less onerous. It does not accept American traders due to regulations. Betfair, however, expresses their odds in a very technical gambling format; hence the need for this site.

How people bet
American regulations are strict, but PredictIt.com has been allowed by the federal government's "Commodity Futures Trading Commission" and is easy to use. However, see the following section for why PredictIt's prices are systematically too high. Non-Americans also have the option of using Betfair.com.