There are stringent mortgage requirements for buyers of apartments. The Chinese government has not printed much money for the past couple years. The interest rates and bank reserve ratio have remain high. All these mean liquidity was introduced only when needed.Im not sure there is corruption regarding evergrande. AFAIK, china´s real estate is in a huge bubble (fuelled by constant liquidity from the government in order to grow the economy). Unsurprisingly, you have a situation like this.