1. Sales tax: Amazon is now required to charge its shoppers sales tax in 20 states in the U.S., according to its website. A research report published this month found that households in five states in which Amazon recently started charging sales tax spent 9.5 percent less on Amazon after the change was made.
"Households substitute Amazon with other retailers: either online retailers who are exempt from collecting sales tax, or in-state retailers (online and brick-and-mortar)," the report reads.
If Amazon doesn't talk about it in its prepared remarks, count on an analyst or journalist asking about it on the earnings call that follows.
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2. AWS: Amazon Web Services has become a hit among startups looking for data storage and computing power without all the infrastructure. But with an all-out pricing war being waged by Amazon, Google and Microsoft, analysts and journalists alike would like some more color on where the business stands.
"While Amazon has cut AWS prices 42 times in the past, cloud competition appears to be heating up and this could impact … AWS revenue," J.P. Morgan said in a research note.
3. Unit sales growth: The chart below shows year-over-year growth in the number of individual units or products Amazon has sold.