Ben Kumar: Why you need 'common sense' investing

Over the last five years, the US stock index has outperformed other global markets by 80%. So, people ask: "Why didn't you just invest in the USA?"  Over the same five years, the US tech sector has outperformed the broad US market by a further 50%.  So, really: "Why didn't you just buy the US tech sector?" Maybe you were fortunate and did just invest in US technology. But Amazon has outperformed US tech by over 400%. So, in the end: "Why didn't you just buy Amazon?" The same questions are asked in the world of bonds. Why not buy just Italian bonds, or just companies that prod...