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Because it makes a huge difference whether you have hundreds of small positions in your portfolio, which you can never keep track of and for which you have your own transaction costs, or whether you have the world market bundled in one product. Whereby it must be said that even in a world ETF only the top 100 - 200 positions are worth mentioning and the remaining 3000 positions are at most background noise.
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@Stockmarketbird The advantage of ETFs is that the major shares are always different over the decades (with a few exceptions). The ERF then takes care of that for you. Hence the outperformance of broad ETFs compared to many / most private investors.
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