CSI 300
An index of the largest companies traded on the Shanghai and Shenzhen exchanges.
How to read the number
It represents the domestic A-share market, access to which is rationed for foreigners through quotas and the trading links with Hong Kong.
When the metric lies
The same company lives two lives onshore and in Hong Kong: its prices there diverge, and there is no single quotation to point at.
Also known as: china a-shares index