This phenomenon is known as the "Organic Percentage". You execute a mail group and a holdout group, very simple testing.
| Organic Percentage: Mail & Holdout Test Groups | ||||
| This | Other | Website | Total | |
| Catalog | Catalogs | Demand | Demand | |
| Mail Group | $3.00 | $4.00 | $8.00 | $15.00 |
| Holdout Group | $0.00 | $5.00 | $9.50 | $14.50 |
| Increment | $3.00 | ($1.00) | ($1.50) | $0.50 |
| Organic %, Catalog = (3.00 - 0.50) / 3.00 | 83.3% | |||
| Organic %, Total = 14.50 / 15.00 | 96.7% | |||
This outcome is seldom if ever mentioned by e-mail vendors or catalog marketing vendors. The opposite outcome is mentioned all of the time --- we hear that catalogs and e-mails drive sales across all channels. This outcome is more common than the oft-publicized "catalogs drive sales to all channels" outcome we read about.
Almost nobody talks about reducing marketing expense and increasing profit because we are mis-attributing orders to customers who would have ordered anyway. The vendor ecosystem would be hurt if this outcome were published on a frequent basis.
In this case, 96.7% of customer demand happens anyway .. only 3.3% of the $15.00 is because of catalog marketing.
Quantifying the organic percentage is the single most important thing that catalog and e-mail marketers will do in 2009.
Acting upon the organic percentage is the single most important thing that catalog and e-mail marketers will do in 2010.
At this time, the majority of my Multichannel Forensics projects require me to greatly reduce marketing expense while keeping demand coming in at a high rate. It is likely that you'll be spending a ton of time on this issue in 2010 as well.
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