Look at the historical graphs: VOO vs. VTI, for example, or VT vs. IOO or more concentrated developed-market/global large-cap indexes. In many of these cases, the more concentrated exposure has outperformed the broader, more diversified version over long periods. So why do we tend to dismiss concentration as inherently riskier without looking at the actual historical evidence? At what point does diversification become over-diversification and simply dilute exposure to the winners?
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