Ledger of 20 products ranked by the effect of holding a tap line, measured as the change in units sold per 1,000 visitors when a product is on tap versus off tap. Ten products gain, from plus 9.4 to plus 25.4, totalling plus 129.7. Ten products lose, from minus 2.7 to minus 10.3, totalling minus 52.1. The list nets 77.6 today, so reallocating the negative lines would improve it by 67 percent.