As I understand the story, that's mainly because others are kept from competing by stifling bureaucracy. Favored companies can get permits, unfavored ones can't.
There are also a number of alternative possibilities why companies can't survive without government help. None of them mean that China is richer due to interventionism. For instance, a government might use taxes to subsidize certain companies' operations. These companies might drive up the cost of labor, pricing the non-subsidized companies out of the market. Yet without the taxation and subsidization, the society would be better off because the companies which thrived would be the most efficient at turning inputs into outputs rather than the ones the government picked (never mind the distortionary effect of the taxes).
There are also a number of alternative possibilities why companies can't survive without government help. None of them mean that China is richer due to interventionism. For instance, a government might use taxes to subsidize certain companies' operations. These companies might drive up the cost of labor, pricing the non-subsidized companies out of the market. Yet without the taxation and subsidization, the society would be better off because the companies which thrived would be the most efficient at turning inputs into outputs rather than the ones the government picked (never mind the distortionary effect of the taxes).
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