How did Macedonia's wealth compare to the wealth of other countries?

Keegan focuses on the wealth of the Macedonian kingdom and how it compared to the other, richer nations. However, what Alexander lacked in funds, he made up for with strategy and fortitude. It should also be made clear that the Kingdom of Macedon was not poor, but simply not as rich as many of its neighbors and enemies. Alexander could, however, claim an abundance of natural resources, livestock, grains, and fertile lands. The latter was due in part to the irrigation system installed by Philip.