New Delhi, April 13 -- For a factory worker in Haiti, the war in distant Iran means he now has to walk two hours to work and the same distance home each day, because he can no longer afford public transportation.

On a recent morning, Alexandre Joseph, 35, fretted about his family's future in a loud voice, attracting the attention of passersby in Port-au-Prince, Haiti's capital.

"The government raised the prices of gasoline, diesel and kerosene, hitting my family. I now am unable to feed my two children on the salary I have," he said.

The conflict in Iran has caused oil prices in Haiti to surge, disrupting critical supply chains, doubling transportation costs and forcing millions of undernourished people to cut back on already scarce me...