Google Stock Price VS Algorithm Updates: Positive Correlation?

There always seems to be a lot of speculation, or ranting to put it mildly, when Google pushes out major algorithm updates. Many SEO’s have suggested that Google constantly shuffles the ranking deck to make AdWords more appealing to business owners.
What is AdWords Pay-per-Click Advertising?

Pay per click advertising harnesses the power of the search engines to make your site more visible. When you put your site up on the Internet, you may opt to participate in pay per click advertising. Google’s pay-per-click or PPC advertising program is called AdWords.