What is the most common goal of a trade agreement?

Implement a common currency for the countries involved.
Eliminate trade barriers between the countries involved.
Forgive common debts between the countries involved.
Free movement of citizens between the countries involved.

The most common goal of a trade agreement is to eliminate trade barriers between the countries involved. This could include reducing tariffs, quotas, and other restrictions on the movement of goods and services across borders, in order to promote economic growth and increase trade between the countries. While some trade agreements may also involve other objectives, such as promoting a common currency or facilitating the movement of citizens, the primary goal is typically focused on promoting and facilitating trade.