Calculating how to measure direct marketing ROI (return on investment) is fairly simple:
Sales X Value / Cost = ROI
Below is a guide as to how you can improve your ROI in 5 simple steps...
1. Measure response at the GROSS level
Rather than count only incremental sales (target cell sales minus control cell sales) from your campaign simply count all the sales.
Control cells can be tricky to set-up so why bother?
Further measuring incremental response can be hazardous to your business case as for most campaigns it is only 20-40% of gross response. This is particularly true for brands which have other sales channels such as a retail network.
2. Massage your value
If the sums are getting tricky simply inflate the value of the product or service.
Don't think seriously about whether you should use a 1,3 or 5-year NPV (net present value) just use the highest one! Never mind that to achieve the higher 5-year value might involve further customer investment.
Whatever you do don't look back 6-months later at the actual NPV of the customers your campaign acquired and re-adjust your ROI expectations for the next campaign. This so called Total Value Management approach can make any business case dead in the water.
3. Drive down your pack cost
Yet another way to make that business case is to drive down the cost of the communication. For a letter and A5-leaflet it is perfectly possible to get something produced for 24p including postage.
This is about economies of scale. Just mail a huge volume well past the point of customer relevancy (see step 5) and get the stuff printed in Eastern Europe.
Don't let the allure of the agency brains trust fool you into buying any of that expensive strategy & planning stuff.
Just ignore those brand communications or CRM guys who insist that direct marketing has a role to play not only as a highly optimised sales channel but one that can build relationships too.
4. Don't do test and learn
It just drags down your overall ROI.
It's tricky to set-up. If you want to learn anything worthwhile you have to really think hard about it. Plus it takes ages to get results back.
5. Evaluate the campaign at an overall level
I have left the most important tip till last. Make sure you present your results at the highest aggregate level - blended results can hide many sins.
For example, don't look at the results disaggregated by response decile. Whilst you can get positive ROI on mailing the top-6 deciles (60% of the base) it is very inconvenient that the top-2 deciles only create all the profit whilst the next 2 only break even and the next 2 have negative ROI.
Don't let anyone see (especially those finance guys) that by mailing half the volume you could achieve c85% of the sales, 95% of the profit and double your ROI.
You never know what might happen - they could halve your budget and give it to those web freaks!
Of course if you want to measure your direct marketing properly you'd do the opposite of this guide but then that involves doing communications that genuinely engage your customers creating additional demand, rather than simply hoovering-up sales you would have got anyway through other channels.
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