<https://data.wordlift.io/wl82989/entity/return_on_investment_2>
<http://schema.org/description>
"Return on investment (ROI) is a performance measure used to evaluate the efficiency of an investment or to compare the efficiency of a number of different investments. It is one way of considering profits in relation to capital invested."
<https://withjasonbarnard.com/2019/yoastcon/four-horsemen-of-the-apocalypse-rand-fishkin/>