This article from Forbes is very interesting when you look at how they arrive at their numbers. These same principals should be used when evaluating properties in Panama.
Excerpt: The relationship between rental yields and housing costs matters because a low rental yield is a good indication of a stretched market--one that has a bubble--since these markets are more likely to face downward price pressures or grow at a slower rate. Possible higher returns attracts more buyers and pushes up prices.
