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If ALL Google's commercial content goes PPC --- this increases overhead and the prices of products. (obviously)
So if consumers search for commercial content that is all paid for, they will essentially be paying MORE for these products, compared to if they had used a "free" search engine.
Wouldn't it make sense that in time Google could suffer, if users realized they could always get a better deal on goods in another "free" search engine?
Like registering domains where I'm sure profit margins are really slim, --- the cheapest registrar will never be #1 on the PPC, but thats the one you want.
So in a sense, if Google had 100% paid for commercial results, they would only be feeding users OVER-PRICED products and services, does that make sense? :)
So in essence, going to stop rambling and say.. I totally agree with you, the day google starts charging merchants in ANY way shape or form, their goes all credibility and they will be the next Altavista (long forgotten about and abandoned for the new guy on the block that takes their place)
Indeed, one could argue that current prices on the Web are higher because the sellers enjoy subsidies in the form of free SE listings. Affiliate sites are a perfect example of this: Google lists thousands of affiliate sites that offer the same goods or services from the same vendors at the same prices. Even if they could charge lower prices than their competitors, most affiliate sites wouldn't do so because they'd find it more profitable to compete through SEO techniques. That may be good for the affiliate sites and their vendors, but it's bad for consumers whose ability to find lower-priced competitors is thwarted by information overload.
It's also important to remember that Google is only one venue for publicizing goods and services. A well-run business won't put all of its eggs in one basket, and it won't charge more to people who read its paid advertising than to people who don't. Let's use an example from the bricks-and-mortar world: Ernie's Electronics City publishes a weekly flyer with its weekly specials on TVs, computers, CDs, etc. Some of those flyers go into the Sunday newspaper (expensive), while others sit in racks inside the store entrance (free). Now, Ernie's is going to charge you the same $399 for a Sony TV whether you got the flyer from the newspaper or when you walked into the store. It's the same with online sales: Ernie's won't charge $409 to the person who clicked an Overture or AdWords listing and $399 to the person who clicked a free listing in Google. (Or, if it does, it'll lose the sale to the other Overture or AdWords advertiser who's charging $399.)
Bottom line: There may be good arguments for keeping free commercial listings on Google SERPs, but economic theory isn't one of them.