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In page Guangdong:

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After the communist revolution and until the start of the Deng Xiaoping reforms in 1978, Guangdong was an economic backwater, although a large underground, service-based economy has always existed. Economic development policies encouraged industrial development in the interior provinces which were weakly joined to Guangdong via transportation links. The government policy of economic autarky made Guangdong's access to the ocean irrelevant.[citation needed]