No business can change what it does not measure. Racing's public measurement of support, via wagering, hides serious issues. Recent stories have continued to cite declines in total handle, wondering just what is at play. How that handle has been derived has changed dramatically, but that's not reflected in the overall numbers. Over the last century, U.S. racetracks have reported total handle on their races and, for most of that time, it was one metric that accurately depicted the health of the business. But in our modern era of simulcasting,...