The Beijing government may think that by blocking Hong Kong's progress toward the democratic election of a chief executive, it is safeguarding both the region's and the nation's economic interests. But it is quite likely to have the opposite effect.
China released a report in April disclosing that much of its arable land is contaminated with heavy metals that are entering the food chain. It doesn't bode well for consumers and suggests that China increasingly will have to import food.
In recent years, U.S. exports to China have been growing faster than Chinese exports to the U.S. Similarly Chinese investment in the U.S. is growing faster than U.S. investment in China. Trade frictions are inevitable.