Imagine you are in the middle of the Mekong Delta in Vietnam.
Selling delicious products on the floating market.
Amongst millions of ambitious sellers in house boats.
...How do you make sure you only attract the people relevant to what you are actually selling?...
...Or from a hungry customers point of view: How to avoid pointless hours searching in the burning sunlight finding meat when you are really looking for refreshing Veggies?...
...Well there is one simple answer: highly relevant, targeted ads in prominent spots above all the competition :-D!
(A picture from June 2010, Mekong Delta Vietnam)