Mexico's peso surged on Tuesday by the most in over two years, boosted by a global emerging markets rally and soothing comments from the country's newly elected leftist president that he will not ramp up spending. "I look very much forward to working with him", tweeted President Trump on Sunday evening before the leftist Obrador's vote count was projected to be around 53 percent.
Since 1929, the Mexican leader has been from one of two parties: the PAN or the PRI.
Opponents of Obrador, have recognized their defeat and Obrador's victory in the election.
Mexico's main stock index and the peso were both down Monday, but analysts at Banco Base attributed the currency's drop to broader global movement in favour of the US dollar and speculation about USA interest rates.
Lopez Obrador, often called by his initials AMLO, told a Mexican television network that Trump's tweet was "very respectful" and that Mexico was "never going to disrespect the USA government because we want them to respect us". "I will not disappoint you and I will not betray my people", he said.
Moody's said in a note: "The outcome of Sunday's elections leaves Mexico at an uncertain, and potentially critical, juncture".
Haq said the U.N. chief "expresses the readiness of the United Nations to work with the new administration continuing a longstanding tradition of excellent cooperation between Mexico and the United Nations".
In brief remarks at a hotel in central Mexico City, Lopez Obrador called for reconciliation after a polarizing campaign and promised profound change but with respect for the law and constitutional order. He later joined the Party of the Democratic Revolution and more recently formed his own party, the National Regeneration Movement - known as MORENA.
"The revolution of consciences has triumphed", the victor told tens of thousands of jubilant supporters who had gathered on Mexico City's central Zocalo Square.
Lopez Obrador won a resounding victory in Sunday's presidential race.
Lopez Obrador is a twice-spurned populist whose supporters hope he will deliver on promises to clean up corruption, reign in spiraling violence and lift millions out of poverty.
Lopez Obrador, who has run for president in every election since 2006, has humble beginnings, flies coach class and says that he will convert Mexico's presidential palace into a public park.
Mexico's benchmark rate is at 7.75 percent - the highest rate among countries with investment-grade credit ratings, analysts noted.
And he paid tribute to the role in the campaign played by outgoing President Enrique Pena Nieto and the media, both of which have felt the bite of his scorn in the past.
The next president will also inherit a simmering dispute with United States counterpart Donald Trump over migration and trade, with talks to rework the North American Free Trade Agreement (Nafta) unresolved, pressuring Mexico's peso currency. The former mayor of Mexico City began his political career as a member of the ruling Institutional Revolutionary Party (PRI).
Compared with his predecessors, Lopez Obrador is likely to be more focused on domestic economic issues than on settling trade issues with the United States, O'Neil said. "That is what brought us to this", she said.