Risk: The tricky part is choosing the right stocks. Graves warns that too many novices jump into the market without thoroughly investigating the company issuing the stock. “You’ve got to investigate each company’s website and be comfortable with their financial statements,” Graves says. “You should spend two to three weeks investigating each company.”

Residual income is calculated as net income less a charge for the cost of capital. The charge is known as the equity charge and is calculated as the value of equity capital multiplied by the cost of equity or the required rate of return on equity. Given the opportunity cost of equity, a company can have positive net income but negative residual income.