After the 1929 stock market crash the US government suspended much anti-trust activity, allowing companies to acquire monopoly power that would boost their value. This policy delayed the recovery from high unemployment, but even that was not enough to rein in the political forces arrayed in favor of supporting the stock market.
1929年股市崩溃后，美国政府暂时停止了反托拉斯活动，默许公司拥有能增加市值的垄断能力。上述政策让高失业问题久拖不决，但即便如此都没能阻止政治力量继续支持股市。