Traders work at the New York Stock Exchange in New York, the United States, on Dec. 13, 2019. (Xinhua/Wang Ying)

Chinese mainland shares held above key levels on Wednesday, with the flagship Shanghai index oscillating between 3,011.72 points and 3,033.23 points, pointing to a continuation of positive sentiment toward A shares. Net northbound inflows into the mainland market through the two stock connect regimes linking the Hong Kong market and the two bourses in Shanghai and Shenzhen totaled 6.09 billion yuan ($870.5 million) on Wednesday. 

This marked the 25th trading day in a row that overseas purchases of A shares exceeded the amount that was cashed out.

Although it's not necessarily the case that greater interest in A shares indicates waning investor interest in US stocks, the US market, now at a historic high to an extent which challenges its company earnings, may suggest a possible switch into lower-risk, yet higher-return options, notably A shares. 

With US President Donald Trump facing impeachment, one of the greatest achievements under his administration - the Dow gaining 10,000 points since Trump's election - will be under mounting pressure to continue flying high.