At US$90 a barrel, the price of oil would be linked to an income loss in the region of about 1.1 percent of GDP next year, according to the bank's calculations.
The report also said the strong economic growth had reduced the number of people living below US$2 a day in the region to about 27 percent -- about 500 million people -- this year, down from 29.5 percent last year and 69 percent in 1990.
But poverty is now overwhelmingly a rural problem, and this is resulting in widening income inequality, the report said.
"Even as poverty continues to fall in the aggregate, it is often the case that lower income groups experience slower income growth than higher income ones," it said.
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