So what are these Amazon rankings, and how are they determined? The rankings work in a similar way to how Google determines what sites come up first on their search engine when people search online. The products on Amazon with the highest rankings will appear first when people search for them, giving them more of a chance of being purchased. The rankings are decided by Amazon’s A9 algorithm, which uses a number of factors to create a kind of league table. More or less, the higher your ranking then the more likely you are to sell your product.