Last month we explored the first of two important digital marketing list subscriber metrics: CPA, the cost to acquire a new list member (see Part 1 here). I also presented a process for determining your maximum allowable CPA – that is, how much it’s worth paying or investing to acquire new subscribers on a name-by-name basis. This month we’ll explore various approaches to assigning economic value to every subscriber already on your list. Let’s start with the clearest way first: the Revenue-Per-Subscriber method also known as RPS.

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