Book excerpt: America's health care troubles largely stem from a great success: modern medicine can do much more today than in the past. So what's the trouble? How to pay for it. In easily comprehensible prose, MIT-trained economist Arnold Kling explains better ways of financing health care for the poor, workers, the disabled, and the elderly. Kling predicts relying less on government and more on private savings would improve health outcomes. A must-read for health care reformers.