Long-term growth
Growth is one of the most important factors that drive asset price. Investing in securities with high-quality and sustainable growth could bring in substantial returns for the portfolio in the long-run.
Diversification
Diversifying within and across sectors/geographical regions mitigates unnecessarily idiosyncratic risk. Diversification enhances risk-adjusted return by not placing all the capital in an underperforming sector while missing a outperforming sector.
Market inefficiency
The investment markets are not highly efficient, meaning there are still information of investment values to be uncovered. Professional and capable investment team can still bring values to investors. Active management is the key tool in creating values.