We do a lot of experiments to test assumptions and build new knowledge about how the Amazon ranking algorithm works. For each experiment, we create new products that are all exactly similar except for the one characteristic we want to test. We then analyze the search results to see if the difference in the one characteristic has an impact on ranking.
With the following experiment, we wanted to find out if it helps to repeat keywords in your Amazon product listings, i.e. if a higher keyword density can improve your rankings.
Objective of Amazon Keyword Ranking Case Study
Keywords can be placed in the following different areas of an Amazon listing:
- Product title
- Bullet points
- Seller Central search terms
- Product description (this is not a standalone keyword field per se though, and will only be taken into account in combination with other fields)
We tested whether repeated keyword placement and density across these areas can give you an advantage for your products’ rankings.
Setup of Testing Amazon Keyword Ranking
We created several groups of products on Amazon for this experiment. Each group consisted of 4 products, and each group had a specific keyword. This keyword was then entered 1 to 4 times in the different keyword fields, all other things being equal about the products. So for example, the first product in a group contained the keyword only in the title, while the fourth product had the keyword in all fields (title, bullets, search terms, description). We then checked the rankings of the different products when entering the group’s keyword as a search query.
Results of Case Study
The table shows the relative rankings of the products 1-4 for each group, and we can see that there is no systematic relationship between keyword density and the ranking for a product. Rankings didn’t seem to be affected in any way, so it seems that rankings are determined randomly for products that contain a given keyword and are otherwise identical.
Insights for Keyword Optimization on Amazon
1) Keyword repetition across multiple fields does not improve search result rankings.
2) Nevertheless, keyword repetition is not punished by Amazon’s algorithm.
The key take-away here: since entering keywords repeatedly in different keyword fields does not improve a product’s ranking, you should not waste the limited space but rather try to find as many unique keywords as possible to make sure your product can be listed for as many search terms as possible.
Put the most important keywords in the fields with the highest weight (title > bullets > search terms > description).
Need some (free) help with Amazon keywords?
Sellics has a free Amazon keyword tool called Sonar which lets you search for related keywords, reverse look-up by ASIN and more. Check out the free Amazon keyword tool here – and use these keywords for listing optimization, PPC campaigns, product research, and more!