Competition CPC SEM Sites 
Startup Professionals Musings
OCTOBER 3, 2010
Probably every one of you who has a business and a website have been approached through email or personal contact, and asked to spend money on Search Engine Marketing (SEM). SEM is sometimes called “buying your way into search results.” Cost per click (CPC). For sites displaying the ads, this is called pay per click (PPC).
Startup Professionals Musings
MARCH 23, 2013
Cost per click (CPC). For sites displaying the ads, this is called pay per click (PPC). For Google, this is pay per impression (PPI), or pay per mille (PPM) per thousand impressions. Cost per action (CPA). Another alternative was added a couple of years ago to mitigate the problem of people clicking just to get paid (click fraud).
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