Same here. I’d figured out that one of the two local places didn’t reset their invoice counter every day so it was easy to get an “average” sales total for the week. I even enlisted the help of a couple of friends and had them go in at various times to collect their receipts. By collecting even a modest amount one can tell that store’s average sale with no trouble.
There is also data published that gives the national, per household, dollars spent on pizza. By getting the number of households in your service area it’s easy to grab an idea of what your “potential” sales should be. Matching those numbers up with what you have found to be the true average during your little stint as a commercial spy can yield a pretty accurate figure. At least it worked for us.
