CPDCPD ( Cost per Duration ) , or charge by time of posting banner . With this method , advertisers often put the banner ( gif , flash or video ) on the popular website like VnExpress , AP ... This type of advertising applied to corporations , companies have the budget large advertising because other forms of advertising are very expensive . CPD is often subject to ad sharing , instant 1 on 1 website location is often shared with other clients (usually 3 ) .CPD Forms caught most of the major sites of Vietnam . Because this kind of technique is quite simple , most sites do not report data for
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