It's becoming common, but it
has obvious weaknesses:
When the government favours one lot of companies, the others suffer. In 2009 China Mobile and another state giant, China National Petroleum Corporation, made profits of $33 billion—more than China’s 500 most profitable private companies combined. State giants soak up capital and talent that might have been used better by private companies. Studies show that state companies use capital less efficiently than private ones, and grow more slowly. In many countries the coddled state giants are pouring money into fancy towers at a time when entrepreneurs are struggling to raise capital.
Those costs are likely to rise. State companies are good at copying others, partly because they can use the government’s clout to get hold of their technology; but as they have to produce ideas of their own they will become less competitive. State-owned companies make a few big bets rather than lots of small ones; the world’s great centres of innovation are usually networks of small start-ups.