Here is search logs of 650,000 AOL users. It's very interesting to view search history of particular person and analyze his personality. Let's do it together! Read more about AOL search database scandal or view research papers on web searching.
marginal revenue
In microeconomics, Marginal Revenue (MR) is the extra revenue that an aditional unit of product will bring to a firm. It can also be described as the change in total revenue/change in number of units sold.