Malpass told the Reuters Next conference on Wednesday that interest rate reductions could play a big role in some of the poor-country debt restructurings being done under a new G20 framework, noting that some developing countries were paying very high interest rates of 6% to 7% on official bilateral debt.
Malpass expressed frustration about the lack of private sector support for the G20's Debt Service Suspension Initiative (DSSI), which allows the poorest countries to defer official bilateral payments through the end of June.
He said he hoped the debt moratorium could be extended but said he could not prejudge this decision.
"I urge the private sector to take a look country by country at the overindebtedness and look for ways to share the burden with the official bilateral creditors that process the G20 was able to launch last year,'" said Malpass, a former chief economist for Bear Stearns and former senior U.S. Treasury official.
Malpass said the G20, now under Italy's leadership, had made good progress by adopting a common framework for debt treatments that effectively bound China, the world's largest official bilateral creditor, into the Paris Club of official bilateral creditors, but private sector participation was critical.
"It can only work if the private sector begins to come up with techniques for participation," he said, adding that the World Bank was pushing to use its own funding to help countries hire lawyers and buy back debt at a deep discount.
The World Bank was pushing the G7 advanced economies, the G20 and the incoming administration of U.S. President-elect Joe Biden to exert new leadership on addressing too-high debt levels, and particularly on the commercial side of the issue, he said.
A major debt reduction initiative lowered debt burdens a decade ago, but since then lending had increased sharply by both China and through private sector bond markets.
Malpass said he expected to see some advances in individual countries, including potentially Chad, which is working with the World Bank and the International Monetary Fund to resolve its official and private sector debt problems.