As U.S.-marketed television receivers have been required to include factory-installed UHF tuners since 1964, the rapid expansion of broadcast television onto UHF channels in the 1970s and 1980s (along with increased deployment of cable and satellite television systems) has significantly reduced the number of one-station markets (limiting them to those with population densities too small to be able to make any additional stations economically viable), providing networks with a larger selection of stations as potential primary affiliates. A new station which could clear one network's entire programming lineup better serves the network's interests than the former pattern of partial access afforded by mixing various secondary affiliations on the schedule of a single local analog channel.
The best way to think about affiliate marketing is quality over quantity. There are a lot of small websites that will promote your product, but the key is finding a small number of partners that will deliver conversions. For example, an equity management services firm has over 20,000 affiliates in its system, but only about 25 affiliates generate 85 percent of revenue.
Many voucher code web sites use a click-to-reveal format, which requires the web site user to click to reveal the voucher code. The action of clicking places the cookie on the website visitor's computer. In the United Kingdom, the IAB Affiliate Council under chair Matt Bailey announced regulations[46] that stated that "Affiliates must not use a mechanism whereby users are encouraged to click to interact with content where it is unclear or confusing what the outcome will be."

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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