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"Fee collection must be governed by law and further regulated," said Liu Shangxi, head of the Chinese Academy of Fiscal Sciences.

"Data from the academy show that people's consumption from 6 pm to 10 pm almost equals half their consumption during daylight hours," he said. "Vacations also give people more time and opportunities to spend money."

"Economic growth is gradually stabilizing, which jazzes up demand to bolster prices," said Xu Gao, chief economist at Everbright Securities Asset Management Co Ltd.

"Data is the most important element in redefining retail," said ICBC's Wu. "With big data, multi-dimensional digital marketing can help increase the monetization rate of advertisements as well as the conversion rate of the online and offline merchants with the platforms."

"Diamond jewelry is expensive and people buy it less frequently. They usually purchase after careful consideration. So, only renowned brands and top-quality diamonds with beautiful designs are more sought after by consumers," said Li Zheng, research manager at Lead-Leo.