Untapped ideas...

A tiny tax to spur aid to smaller, developing countries... Of course, the Republicans would reflexively label it socialism...

The one untapped source that could easily provide the amount of money needed is the foreign currency market, which handles almost $800 trillion in trades annually, all of which is untaxed. A tiny levy of 0.005 percent on transactions involving the world’s most traded currencies — the dollar, the euro, the pound and the yen — would raise more than $33 billion annually for development, while not hurting the market or affecting the average international traveler. The tax could be collected automatically by the computer system that handles foreign exchange transactions — so it would be easy to put into place, and impossible to evade. And because not all currencies would be taxed, only the countries whose currencies would be affected would need to consent. France already supports the idea, and Chancellor Angela Merkel of Germany has signaled her willingness to consider it.

... The banking industry has so far managed to keep currency trading untaxed, but this industry, which has so recently been dependent on government aid, has a duty to give back. President Obama has reminded Wall Street leaders about what he called their “obligation to the goal of wider recovery, a more stable system and a more broadly shared prosperity.” The same principle applies internationally.