1) traders might be attacked by other civilizations and looters
2) They may disagree upon the pricing and the worth of traded items
3) One may want to get rid of a item, another may not want to buy it, resulting in hatred and eventually war if it becomes too 'aggressive'
hope this helps
Secretary of State Hillary Clinton called the Internet and mobile technology the "destroyer of stable democracy".
It meant for the city to be 'dry' is when they have a low water count and not much water like a drought
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It demonstrates the idea of fulfilling your destiny, and following your dharma. Arjun makes the decision to fight and thus completes his duties, virtues and destiny. This is framed as the right decision, doing what you are supposed to do.