What is the tenet that China follows to ensure that Hong Kong's exuberant capitalism is retained despite the communist leanings of mainland China?

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Many thought the territory's laissez-faire ways, exuberant capitalism, and gung-ho spirit would prove unbearable for Beijing's heavy-handed communist leaders. But except for changes in tone and emphasis, even opponents of communist rule concede that Beijing is honoring the "one country, two systems" arrangement.

What Is the Tenet That China Follows to Ensure That