Hu Li Yang's theory:
1) If an index's price drops by 50% from its peak, it has entered an "fair value" price point
2) If an index's price drops to around 25% from its peak, it has entered a "extremely undervalue" price point
3) When recovering from the bottom, the index will always face selling pressure at 2x the bottom price
4) During a bear market rebound, you can forget about fundamentals