The following is an abridged version of the Thoroughbred Idea Foundation's #FreeDataFriday entry for this week. The full version can be read at this link. Here is a simple question: How much revenue does a horse race produce for the horsemen running horses in that race? The answer is incredibly complex, and in many jurisdictions, almost impossible to discern. A publication from the Thoroughbred Owners of California in 2016 offers a glimpse into an answer, at least for races run in that state. While these numbers are likely to have...