Future $: Average total rebill revenue earned by the affiliate due to sales from a site. Generally this equates to the average sum of all rebills.

每推销一个产品获的收入的平均数，个是网实际销所的平均数，所以他受（退款，营业税，短期销）影响，短期销，例如退票支票，并不影响个数字。