Artist Ai Weiwei says China at 'critical point'

By Noah Barkin BERLIN (Reuters) - Ructions in the Chinese stock market and currency suggest the country has reached a "critical point" where the absence of democratic freedoms is a growing threat to economic stability, Chinese artist and free-speech advocate Ai Weiwei says. Speaking to Reuters at his atelier in the basement of a former brewery in Berlin's Prenzlauer Berg district, Ai was more outspoken about China's one-party system than he has been in a series of interviews