The North American Free Trade Agreement (NAFTA) is primarily a free trade agreement that extended the Canada–US agreement of 1989 to Mexico in 1994. It achieved its primary purpose, namely, to free up trade and to safeguard investments in the three participating countries: nominal trade between the three countries more than tripled, from $290 billion in 1994 to $930 billion in 2007. NAFTA also affected migration directly and indirectly. It contains a number of (limited) provisions that expedite the movement of professionals who have job offers in a NAFTA partner country, so that an unlimited number of Mexicans with college degrees can work in the US indefinitely if they have US job offers.