China has called on the public to report any suspicious activity to assist in its latest campaign to root out espionage. That has foreign businesses worried, since some of the market data they routinely collect to make decisions might be considered national secrets under China’s new data security law. How will all this affect foreign business in China? And offshore-listed China stocks have fallen into a see-saw pattern lately, rallying one week, only to fall the next. What’s driving the trend, and how long will it last?