If you want a discussion of Supply-side policies, we'll need to set a framework for what constitutes Supply-side policies. Supply-side theory isn't merely "tax cuts." If that were the case, Keynes would be a Supply-sider since he believed in tax cuts as well. From a theoretical perspective, Supply-side holds higher tax rates don't necessarily produce higher revenues and there's a rate at which revenue is maximized. This a point that Larry Summers (an economist for the Clinton administration) agreed with when he said tax rates above fifty percent are counter productive from a revenue perspective.