An aging population, which will raise the cost of Social Security, is part of the story.But the main driver of future deficits is the ever-rising cost of Medicare and Medicaid.

• 人口老龄化会增加社会保障成本只是部分原因，未来财政赤字的主要原因是不断上涨的医疗保险和医疗补助成本。