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It’s the busiest time of the year for shoppers and merchants alike, but Amazon Prime members have the added benefit of free two-day shipping from the online retail giant, as well as access to extras like Amazon’s media libraries for streaming music, movies, and TV shows for just $99 a year.
Based on estimates charted for us by BI Intelligence, membership to Amazon Prime has been spiking over the last year, and is expected to reach roughly 58 million members worldwide by the end of 2014. And bundling so many services into Amazon Prime seems to be working: According to RBC data, 40% of Prime members have spent more than $200 on the website in the last 90 days, compared to only 13% of non-Prime members. 
bii sai cotd amazon prime subscribersBI Intelligence