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Apart from dealing with the availability of upstream and downstream supply chains, some US businesses moving back home also have to face the reality of leaving China's lucrative consumer base to their global competitors, said Chen Wenling, chief economist at the China Center for International Economic Exchanges.

Another key part of the positive psychology literature is called "grit", which means the ability to do the work needed to reach a goal, to stick with it, to not give up. Angela Lee Duckworth, a Chinese-American psychology professor, also at the University of Pennsylvania, developed a test for grit. She found a technique called "growth mindset", which shows struggling students that they can build their mental capacities by focusing on special areas where they are having difficulties. Just letting students know that they can improve makes a big difference in their attitudes, Duckworth says.

Apart from the internet and tourism sectors, the province is also stepping up efforts in 10 other pillar industries, including high-efficiency agriculture, medical tourism, exhibitions and modern logistics, according to an annual government work report released in January.

Another traditional first-tier city, Shenzhen, however, only ranked sixth in social consumption of around 289 billion yuan.

Another technique would be to pick up readings from the propellers themselves. For example, if your dog sticks its nose into a drone’s business, the propeller could pick up on the intrusion by detecting a change in electrical current, a shift in vibrations or even a difference in the sound of the spinning blades.