What’s the difference between these two images?

Look closely. My friend got both of these offers mailed to him recently. * * *(Click to see larger photos.)  Notice the different offers, the different designs, even the salutation "Dear ___." This is how real marketing is done--not by handwavy marketers saying "I think red is better!" but by actual, rigorous data analysis. [yellowbox]I got so tired of all the ...

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