The returns would be attributable solely to my ability to market time the bond futures market.

回报率仅仅取决于,我选择买卖期货的市场时机的能力

耶鲁公开课 - 金融市场课程节选

When the housing market is in decline, the ability to sell houses drops dramatically.

当住房市场衰退时,房屋销售量就会急剧下降

耶鲁公开课 - 金融市场课程节选