At the same time he admitted that large-scale write-offs are politically difficult.
Speaking at Advancing Asia Conference, he said financial boom preceding the Great Recession left industrial countries with an overhang of debt, which was holding back growth.
"While the remedy may be to write down debt so as to revive demand from the indebted, it is debatable whether additional debt-fueled demand is sustainable. At any rate, large-scale debt write-offs seem politically difficult even if they are economically warranted," he said.
While monetary policy cannot substitute structural reforms and elevate growth potential, the central banker said "no central banker can claim they are out of tools".
Stating that all monetary policies have external spillover effects, he said if interest rates are reduced, exchange rate also typically depreciates, helping exports.
Rajan said there are few areas of robust growth around the world, with the International Monetary Fund repeatedly reducing its growth forecasts in recent quarters.
"This period of slow growth is particularly dangerous because both industrial countries and a number of emerging markets need high growth to quell rising domestic political tensions," he said.
He however cautioned that there may not be an international agreement on the issue as a number of country authorities like central banks have explicit domestic mandates.
He suggested a period of focused discussion, first outside international meetings, then within international meetings.
Such a discussion need not take place in an environment of finger pointing and defensiveness, but as an attempt to understand what can be reasonable, and not overly intrusive, rules of conduct, he said.
Rajan said IMF's Articles of Agreement calls for members
to avoid manipulating exchange rates or the international monetary system in order to prevent effective balance of payments adjustment to gain unfair competitive advantage.
In practice, it may be difficult to determine if a policy is targeted at attaining a level of exchange rate.
Direct policy actions such as intervention in the foreign exchange market or indirect policies such as monetary, fiscal, and trade policies or regulations of capital movements, regardless of the intent or purpose, can affect the level of the exchange rate, and can be interpreted as "manipulation", he said.
"The more pertinent question, therefore, might be what can the Fund really do once its Executive Board determines that a particular country is in violation of its obligations under the new rules of the game?
"Hopefully, the clear focus on the downsides of the particular country's actions for the rest of the world will lead to political and economic pressures from around the world that make the country cease and desist. The clearer the eventual rules of the game, the more likely this outcome," he said.
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