<http://schema.org/description>
"A DigitalPoint Forum thread asks if the prices of search ads rise with the price of gas prices.  Some reason that Google AdSense (or YPN) publisher's costs are going up, so the ad prices must go up.  "^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/archives/003836.html>