The traditional August break in Italy is a wonderful time to work on projects which linger on the back burner during the rest of the year. Last August led to the release of a free keyword selection guide (in Italian); this year’s focus is a Course on using the AdWords PPC paid search marketing program.
While capturing some updated screen shots for the PPC Course, I came across an interesting example of a search marketing phenomena known as PPC or AdSense arbitrage.
Search for Milan – Rome Flights
Consider this search for Milan – Rome Flights: 
Figure 1: Search in Google for Flights between Milan and Rome
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