Our Webmaster Guidelines advise you to create websites with original content that adds value for users. This is particularly important for sites that participate in affiliate programs. Typically, affiliate websites feature product descriptions that appear on sites across that affiliate network. As a result, sites featuring mainly content from affiliate networks can suffer in Google's search rankings, because they do not have enough unique content that differentiates them from other sites on the web.
https://support.google.com/webmaster...er/76465?hl=en