Majority of products are not sold by Amazon. Some sellers use price automation software, some use built-in functionality provided by Amazon. Amazons built in functionality allows sellers to set competitive prices relative to other sellers on Amazon.
It has nothing to do with page views, clicks, or cart adds. Sellers cannot see cart adds in real time.
There is a new promotion type used by sellers that allow us to target people who have abandoned cart. We can offer exclusive discounts to those people.