Posters, in the form of placards and posted bills, have been used since earliest times, primarily for advertising and announcements, textual posters, posters, printing techniques, production and printing, including notably the technique lithography. The invention of lithography was soon followed by chromolithography, which allowed for mass editions of posters illustrated in vibrant colors to be printed.
Tuesday, September 2, 2008
Cost per action
Cost Per Action or CPA (sometimes known as Pay Per Action or PPA) is an online advertising pricing model, where the advertiser pays for each specified action (a purchase, a form submission, and so on) linked to the advertisement.
Direct response advertisers consider CPA the optimal way to buy online advertising, as an advertiser only pays for the ad when the desired 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 incorporated this model into Google AdSense but shut down the offering in June 2008. eBay has recently announced a similar pricing called AdContext.
The CPA can be determined by different factors, depending where the online advertising inventory is being purchased.
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