Amazon’s algorithm, known as A9, influences where your products appear for specific keywords or phrases on the Amazon search results page. Unfortunately, the algorithmic factors are not explicitly defined by Amazon. However, the A9 algorithm seems to rank specific products based on a number of direct and indirect factors. In general, sales performance history, text match relevancy, price, and product availability seem to most directly impact your product’s ranking. Although your fulfilment method, product reviews, and images, the use of EBC, advertising, and promotions seem to have an indirect impact as well.