 Favourite-longshot bias

In gambling and economics, the favourite-longshot bias is an observed phenomenon where on average, bettors tend to overvalue "long shots" and undervalue favourites.That is, in a horse race where one horse is given odds of 2-to-1, and another 100-to-1, the true odds might for example be 1.5-to-1 and 300-to-1 respectively.