Split testing will ensure that you’ll discover which content resonates well with your audience for promoting the affiliate offer.  Sometimes you may discover that the content (email in this case) without social proof in form of a case study performs better than one with the case study because your audience trusts you not to try to make a quick buck from them by recommending a poor product.
Affiliate marketing is commonly confused with referral marketing, as both forms of marketing use third parties to drive sales to the retailer. The two forms of marketing are differentiated, however, in how they drive sales, where affiliate marketing relies purely on financial motivations, while referral marketing relies more on trust and personal relationships.[citation needed]
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