September 27, 2022

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The surge in consumer time and money spent online because of the pandemic led to a significant boom in the affiliate marketing ecosystem. Much of the increase in ecommerce activity was facilitated by affiliates across a range of channels—from established formats such as coupons and loyalty programs to emerging ones like influencers and BNPL providers.
Publicly available data does not map precisely to the start of the pandemic, but according to research by The Performance Marketing Association (PMA) and PwC, US affiliate marketing grew from $6.2 billion in 2018 to $9.1 billion in 2021. While industry observers do not regularly measure or forecast the affiliate marketing ecosystem, these figures were comfortably ahead of projections made in 2016, when the Rakuten Marketing and Forrester Consulting study forecast that affiliate marketing would grow to $6.82 billion by 2020. That same report estimated that spend would reach $5.94 billion in 2018.
But the report could not have foreseen the significant uptick in ecommerce activity spurred by the pandemic. US retail ecommerce sales rose 84.8% between 2018 and 2021, to $960.44 billion, according to our estimates.
And, to be sure, affiliate was not the only digital ad market in the US to benefit from these changes:

Amber Venz Box, co-founder and president of influencer shopping app LTK, said that between 2020 and 2021, there was a doubling of business collaborations between brands and influencers on the platform. It is difficult to compare the trajectories of these industries to affiliate marketing; The PMA did not publish estimates for future growth.
Investments Made Into Proven Value-Driven Tactics.
Between 2019 and 2021, the investments in affiliate marketing flowed mostly to proven channels. While affiliate marketing practitioners have been focused on content sites and their growing roles over the past couple years, brands spent 2020 and 2021 pouring resources into channels they knew to be effective.
In 2018, 41% of US affiliate marketing budgets went to either cash-back, loyalty, and rewards publishers (27%) or coupon, voucher, and rebate platforms (14%), according to PMA figures. By 2021, those two publishing channels accounted for about half (51%) of the dollars spent in the affiliate space, chiefly thanks to cash-back, loyalty, and rewards’ share growing to 35%; coupon, voucher, and rebate rose to 16%.
Other channels that have grown significantly include:
Emerging channels could have significant implications for the perception of affiliate marketing among marketers. Affiliate had been viewed as a way to drive sales among consumers who care more about price than brand. Many of the space’s newest advertisers were brought into the fold by emerging channels, including influencers, whose endorsements can theoretically elevate a brand and its products more than a discount code or coupon does.
“Our category has really focused on diversifying the partner ecosystem, moving to content,” said Matt Gilbert, CEO of Partnerize. “What does that look like as we move into the next year? Is there a regression to the coupon and cash-back behavior, the last-click behavior?”
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