Dimensional did a study on the impact of diversification on the probability of outperforming the market benchmark. In this case, they are using the MSCI All Country World Index (which you can invest with the VWRA listed on the London Stock Exchange). This post was originally posted here. The writer, Kyith Ng is a veteran community member and blogger on InvestingNote, with username known as kyith and has 1091 followers. Not too long ago, there are talks that the markets have been hard-carry by the largest capitalized companies in the United States. The worrying thing is whether this is healthy or not. I think over the years, Dimensional Fund Advisers have a few good research piece on this. The largest holdings of the MSCI World index are currently Apple, Microsoft, Amazon, Facebook, and Alphabet. Together they make up 13.5% of the index. This is not too concentrated. However, if...