Cost Per Action or CPA is considered the optimal form of buying online advertising from the advertiser's point of view. An advertiser only pays for the ad when an action has occurred. An action can be a product being purchased, a form being filled, etc. (The desired action to be performed is determined by the advertiser.) Google has incorporated this model into their Google AdSense offering while eBay has recently announced a similar pricing called AdContext. A related term, eCPA or effective Cost Per Action, is used to measure the effectiveness of advertising inventory purchased (by the advertiser) via a CPC, CPM, or CPT basis.
The CPA can be determined by different factors, depending where the online advertising inventory is being purchased.
Other common forms, of charging for advertising, include:
CPM (Cost Per Thousand) advertising is the most common basis in the business and is used for most display advertising and rich media. This scheme most closely resembles offline advertising, wherein the advertiser is paying for exposure of their message to a specific audience. CPM costs are priced per thousand.
CPC (Cost Per Click) advertising is also performance based and is common in search marketing, where it is often known as Pay per click (PPC). In this scheme, an advertisement may be displayed (and assumedly viewed) many times, but the advertiser pays based only on the number of user clicks. This system provides an incentive for publishers to target ads correctly (often by keyword), as the payment depends not upon the ad being seen but upon the viewer's responding and following the hyperlink.
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