Answer: Many reasons
Explanation:
There are various reasons that countries enter into trade agreements. Typically these agreements are mutually beneficial for both countries involved. This is for both the politicians but also for the general population. Trade agreements can actually be a means to build positive relationships between countries. If one country has an excess of something, and needs to export it, and another country needs that imported, then that could be a situation where the two countries form a trade agreement so they both benefit greatly.
