Necessity for Circulation of Goods

• As human settlements increased in size through advances in irrigation and cultivation, the need for improving the circulation of goods and people became ever more acute.
  
  
  

Domestication of animals

• In this situation domestication of animals had an important role.
  
  
• The Neolithic people domesticated animals and used them for transportation as well as for food and hides. It made them travel greater distances and when attached with sledge-like equipments they helped them to carry heavier loads.