Why Has US Policy Uncertainty Risen Since 1960?
考察了自1960年以来美国政策相关经济不确定性上升的两类解释：政府支出、税收和监管的增长，以及政治极化加剧及其对政策制定过程和政策选择的影响。
We consider two classes of explanations for the rise in policy-related economic uncertainty in the United States since 1960. The first stresses growth in government spending, taxes, and regulation. A second stresses increased political polarization and its implications for the policymaking process and policy choices.