Mr Saez is well known for his work on tracking the share of national income that goes to the highest earners.

Saez 先生致力于追踪美国最高收入者占有的国民收入份额，他因这项工作而广为人知。

ApeVue, a data provider, offers a hint of what is happening by tracking share prices in the secondary markets, where shares of private firms can be bought and sold.

数据提供商 ApeVue 通过跟踪二级市场的股价来提供正在发生的事情的线索，二级市场可以买卖私营公司的股票。