The New Economic Policy in Soviet Russia (1921) and Deng Xiaoping's reform and opening up in China (1980s) both saw privatizations and significant economic improvement. But those were corrections of rare cases of having way too much (ie, near-absolute) state control, where even stuff like private barbers had been illegal. That said, in the case of Russia of course, wider privatization in the 1990s was disastrous in many ways