Ever imagine Mark Ruffalo, Chris Martin and that one guy from Rage Against the Machine would be in a video together about tax policy?

It's happened. The latest video promoting the so-called Robin Hood tax has all three celebrities showing support for a tax on financial transactions, with the money being used to the benefit of those most negatively affected by the recession (h/t Dealbook's William Alden).

“The idea has been around a long time, but the time has really arrived to put it in place,” Columbia economist Jeffrey D. Sachs says in the video financed by The Robin Hood Tax coalition, an organization of advocacy groups.

Support for the tax, which if adopted could raise billions annually by levying a tax of less than one percent on financial transactions across the globe, has been gaining steam as of late. Celebrity supporters, including billionaire Bill Gates and actor Bill