A powerful factor that diminished perceived risk and encouraged investment and enterprise in the post-WWII era was the so-called “Roosevelt put.” Industrial-country governments all around the world now took fighting depression to be their first and highest economic priority, so that savers and businesses had no reason to worry that the hard times that followed 1873, 1884, or 1929 would return.
此外，还存在进一步拖后腿的因素。在后二战时代，有一个强力因素减少了风险感知并鼓励了投资和创业，那就是所谓的“罗斯福看跌期权”。如今，全世界工业国政府都将对抗萧条作为其首要和最高的经济政策考虑目标，因此储蓄者和企业不必担心1873、1884和1929年之后的艰难时世会重现。