Using a market mechanism to pass on the true cost of fossil fuel usage, including the environmental damage here at home AND in the third world, and the longer term effects of greenhouse gas emissions and resulting climate change.
The Guard Dog also speeds things up by letting you crank drives through a mechanism that'll wipe them as they pass through, even if they're enclosed in metal cases.
Such was the mechanism by which King Hussein of Jordan made his deathbed decision to pass the crown not to his brother Hassan, but to the present king, Abdullah.
But there is good reason to believe that the transmission mechanism is at least partially broken at present, and thus the pass-through benefit to the economy associated with a small decline in Treasury yields (relative to current levels) would likely be infinitesimal.