Principles of Sound Investing - Why Our Approach is Different At the beginning of 2017, several large investment firms were asked to predict the return of the S&P 500 for the year. Their average forecast was 4.5%, while the index ended up growing by about 20%. Results this poor are not unusual. The study has been conducted for 18 years. The difference between the average forecasted return and the actual return was about 13%.Our approach is different because we know something others don't seem to understand - that there are PEOPLE attached to the wealth we are managing.