SUPPORTERS of Colombian left-wing presidential candidate Gustavo Petro of the Historic Pact coalition hold the national flag in Bogota, Colombia, May 22. 鈥 REUTERS

BOGOTA 鈥 The election of Colombia鈥檚 first leftist president, Gustavo Petro, is indicative of widespread yearning for a more equal and inclusive society, analysts and business leaders said, but the former guerrilla will need to act fast to reassure investors.

Mr. Petro, a 62-year-old former mayor of the capital Bogota and current senator, won some 50.4% of votes on Sunday, handily beating construction magnate Rodolfo Hernandez.

The election of a former guerrilla marks a radical change for a country still scarred by decades of conflict and highlights the depth of frustration with the right-leaning political establishment accused of overseeing a wide gap between rich and poor.

Mr. Petro has pledged to fight inequality with free university education, pension reforms and high taxes on unproductive land in the Andean country, where nearly half the population lives in poverty.

His proposals 鈥 especially a ban on new oil projects for environmental reasons 鈥 have startled some investors, though he has promised to respect current contracts. This campaign was Mr. Petro鈥檚 third presidential bid and his victory adds the Andean nation to a list of Latin American countries that have elected leftists in recent years.

Mr. Petro will take office at a time when Colombia is struggling with low credit ratings, a large trade deficit and national debt which is predicted to end the year at 56.5% of gross domestic product (GDP). Oil accounts for nearly half of exports and close to 10% of national income.

鈥淐olombia was governed for so many years by the economic and political elite,鈥 said Gimena Sanchez-Garzoli, Andes Director for the think tank Washington Office on Latin America. 鈥淚n many ways this election is basically the voice of most of the population in the country, especially the rural poor, women, Afro-Colombians, the indigenous.鈥

鈥淧eople didn鈥檛 want a change at any cost, they wanted a change that would actually be with actual proposals which include making the peace accord a priority,鈥 said Sanchez-Garzoli referring to the 2016 peace deal with the Revolutionary Armed Forces of Colombia (FARC), which brought an end to that group鈥檚 role in the nearly 60-year-old internal conflict.

Mr. Petro has pledged to fully implement the FARC accord 鈥 which detractors accuse current President Ivan Duque of failing to adequately support 鈥 and to seek talks with the still-active ELN rebels.

鈥淧etro鈥檚 election may have just saved the peace process,鈥 said Oliver Kaplan, associate professor at the University of Denver鈥檚 Josef Korbel School of International Studies.

On Sunday night, as he celebrated his win, Mr. Petro told his supporters: 鈥淧eace is someone like me being able to be president.鈥

BUSINESS JITTERS
Mr. Petro regularly praises the mostly young protesters who have taken to the streets over the last three years to decry inequality and police violence, in demonstrations where more than 40 people were killed.

The president-elect, who was arrested by the military in 1985 while carrying weapons for the M-19 rebels, has said he was tortured during his 16-month detention. His victory has high-ranking armed forces officials bracing for change.

鈥淭here鈥檚 a segment of the population that is totally opposed to him because of his M-19 past,鈥 Mr. Kaplan said. 鈥淢aintaining security and protection of civilians will depend on good civil-military relations, and it鈥檚 uncharted waters in that regard.鈥

But Mr. Petro鈥檚 proposals will face challenges, not least because of a deeply divided congress where a dozen parties hold seats.

鈥淧etro is going to have a very strong opposition from day one, we鈥檙e going to have a congress that all of a sudden is disjointed from the executive branch,鈥 said Colombia Risk Analysis founder Sergio Guzman.

鈥淚 think this means people鈥檚 priorities have moved beyond the conflict,鈥 Mr. Guzman said. 鈥淭his marks a really stark departure from where we鈥檝e been as a country.鈥

Business leaders and the market were awaiting ministerial appointments, especially for key positions like finance minister, and have predicted volatility in the peso and in bonds when trading opens on Tuesday after a holiday weekend.

鈥淚t will be very important that total confidence between everyone is restored, that there is confidence for businesses, citizens, that there is confidence for investors, that there is confidence with the rule of law,鈥 Bruce Mac Master, president of the Colombian Business Association (ANDI), said in a statement following Mr. Petro鈥檚 victory.

鈥淚n us he can expect a constructive partner,鈥 he said.

Mr. Petro was emphatic that business and development had important roles to play under his government. He has pledged to strengthen agriculture, tourism and manufacturing.

鈥淲e are going to develop capitalism in Colombia,鈥 told supporters on Sunday. Development is needed to overcome the 鈥渇eudalism鈥 and 鈥減re-modernity鈥 from which Colombia still suffers, he said. 鈥 Reuters