今天看了一封Jeff Walker发的邮件，邮件营销如何让订单量翻倍？
答案是：发三封推广邮件，而不是只发一封
事实也确实如此，非常符合消费者心理学的一种做法。
所谓大道至简，很多事情本来就是那么简单，有些人有意无意的就是要搞得复杂。
Want a really simple way to double your sales??
It’s simple… just send three emails for your
promotions instead of one.
I know that sounds too easy, but it works. Of
course, there’s a formula you need to follow for
so you don’t lose engagement with your list.