backlash that included local protests, bank runs, and panic buying. The Chinese leadership halted these price liberalization plans in fall 1988 and instead focused on austerity, price reform, and retrenchment. Corruption and increased inflation increased discontent, contributing to the Tiananmen Square protests of 1989 and a conservative backlash after that event which ousted several key reformers and threatened to reverse many of Deng's reforms. The events of 1988 and 1989 led to the imprisonment or exile of many reformist officials. However, Deng stood by his reforms and in 1992, he affirmed the need to continue reforms in his southern tour. Thanks to his encouragement, in November 1990 the Shanghai Stock Exchange was reopened after being closed by Mao 40 years earlier, while the Shenzhen Stock Exchange was also founded in December 1990. In contrast to the approach of Deng, conservative elders led by Chen Yun called to strike a balance between too much laissez-faire market economy and retaining state control over key areas of the economy. Chen Yun helped preserve the economy by preventing policies that would have damaged the interests of special interest groups in the government bureaucracy. Although the economy grew quickly during this period, economic troubles in the inefficient state sector increased. Heavy losses had to be made up by state revenues and acted as a drain upon the economy. Inflation became problematic in 1985, 1988 and 1992. Privatizations began to accelerate after 1992, and the private sector grew as a percentage of GDP. China's government slowly expanded recognition of the private economy, first as a "complement" to the state sector (1988) and then as an "important component" (1999) of the socialist market economy. 1993–2005 In the 1990s, Deng allowed many radical reforms to be carried out. In 1993, the National People's Congress adopted the landmark Corporation Law. It provides that in state owned enterprises, the state is no more than an investor and controller of stock and assets. Pursuant to the Corporation Law, private and foreign investment in such enterprises must be below 49%. The law also permitted state firms to declare bankruptcy in the event of business failure. In the beginning, Chen supported Deng, carried out and implemented many of the influential reforms that made a generation of Chinese richer. But later, Chen realized that the state still needed an active iron hand involvement in the market to prevent the private sector from becoming untamable.