Скачать или смотреть Using Google Keyword Tool To Find High Value Targets

For most PPC is about maximising traffic to your site and maintaining a reasonable ROI.
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However, what if ROI was the most important metric of all? Affiliate marketers who can bid for and sell any product might not be interested in diminishing returns and might be better off simply switching to a new product.
Likewise agencies working to a clients fixed budget early in the relationship often need to prove exceptional ROI is possible before the client opens up the purse strings, allowing for more wise ranging campaigns.
These videos and the spread-sheets available from the link above show you one solid method for achieving great ROI results from Adwords PPC marketing.