The disease has killed over 2,800 people in Liberia, ravaging the local economies and leaving many with too little money to buy food, it said.
The recent Ebola outbreak has killed nearly 5,200 people overall, mostly in three West African countries.
"Even those living in the most remote communities in Liberia, where Ebola has not been detected, are suffering the economic side effects of this terrible disease," said Ana Revenga, senior director of the Poverty Global Practice at the World Bank.
Collecting data on activity of Liberian households via mobile phone surveys, the Bank said that the hardest-hit were the self-employed working in markets where activity has dried up because of Ebola fears.
"Overall, only about 36 percent of previously self-employed workers outside of agriculture and about half of those originally engaged in wage labor are still working since the crisis unfolded," it said.
The farm sector has shown more resilience in the face of the disease, but at the same time food prices have rocketed, including a 40 percent spike in the price of imported rice in But more than 70 percent of those surveyed said that regardless of the price, they lack enough money to pay for food, the World Bank said.