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Another factor was a rebound in the producer price index, which fell 3 percent year-on-year in June, compared with a 3.7 percent decline in May, the analysts said.

Another supportive catalyst is bond buybacks by the companies themselves, which signal abundant liquidity and a faith in the market's fundamentals. Several issuers have already announced bond buybacks, and more are likely to come. These have been mostly in short-term debt, where the issuer can buy back their bonds at a discount and book a profit now, rather than repay at full value a few months later.

Another example is the working group on maritime logistics, which "is close to the opportunities of the Belt and Road Initiative," said Vuorio. "We can combine our expertise in cooperation projects in third countries with the need of technologies there when it comes to the harbors."

Anyone who participated in illegal assemblies has broken the law, Lam said, adding that police will do their utmost to deter violent acts, including using more-forceful means to stop the violence.

Apart from the global economy, the main priorities for the summit are infrastructure for development, the future of employment, and food sustainability.