It might be better for the upper map to select a colour scale that has a zero point on it - this would represent countries that have the same price as the dollar.
A diverging colour scale would make it easier to distinguish which countries are cheaper and which are more expensive. For example:
It might be better for the upper map to select a colour scale that has a zero point on it - this would represent countries that have the same price as the dollar.
A diverging colour scale would make it easier to distinguish which countries are cheaper and which are more expensive. For example:
http://colorbrewer2.org/?type=diverging&scheme=BrBG&n=7