Answer: GATT
Explanation: GATT which is an acronym for general agreement for tariffs and trade was signed by 23 countries in 1947 and took effect in 1948. However, it was replaced by the World trade organization.
GATT decrees that any country that is a member will give all the other countries who are also members the same right with respect to tariffs and other measures which it gives to the most favored nation with which it sells to.