I think it was because people were overselling investments and saying, there's no limit to this investment but the blue sky above.

我想这是因为,当时人们过度宣传投资产品,并宣称,投资收益无止境,如头顶的蓝天那么遥远

耶鲁公开课 - 金融市场课程节选

If it's too heavily advertised, well that screams out for government regulation to cut back on marketing.

如果是因为铺天盖地的广告宣传,那就要呼吁政府出台法规以控制过度宣传

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选