Geography and wealth have long been perceived as correlated attributes of nations. Scholars such as Jeffrey D. Sachs argue that geography has a key role in the development of a nation's economic growth. For instance, nations that reside along coastal regions, or those who have access to a nearby water source, are more plentiful and able to trade with neighboring nations. In addition, countries that have a tropical climate face a significant amount of difficulties such as disease, intense weather patterns, and lower agricultural productivity. The correlation between geography and a nation's wealth can be observed by examining a country's GDP (gross national product) per capita, which takes into account a nation's economic output and population. The continents along the equator, Africa . Eve