The rich farmland provided a surplus of agricultural goods and any wealth generated was invested in monumental temple buildings, such as those found at Eridu, Uruk and Ur.

• 富饶的土地提供了过剩的农业商品，任何财富的产生都投资入建造纪念性的庙宇中，例如是那些发现于伊里都、乌鲁克和乌尔。