"In many developing countries the proportion of health care spending paid out of pocket is about half of all spending or more. This study examines the distribution of such spending by income and care type, and the variation in spending about its expected value, in order to see whether voluntary...

"Prices in government and employer-sponsored health insurance markets only partially reflect insurers' expected costs of coverage for different enrollees. This can create inefficient distortions when consumers self-select into plans. We develop a simple model to study this problem and estimate...