Industry weights in US and UK market in 1900 and 2017Diversification reduces the exposure to any one particular distinct asset or risk. For the equity portion of the portfolio this can mean spreading investments across the world, diversifying by sector and buying shares in a lot of companies. That’s why low cost funds tracking broad market indexes are considered as a good long-term diversification instrument for an equity portfolio. Another reason for broad market diversification is the questionable ability of the individual investor to select winners or to avoid losers (nearly impossible tasks according to academic research). It is not…