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Recently, a lot has been written about very few stocks – and then above all about a particularly strong group: namely the Magnificent 7, the large US technology stocks, which have been almost single-handedly responsible for the fact that American stock market prices have continued to decline for several months climb above. Many market observers view this with concern and draw parallels to the phase shortly before the dot-com crash in 2000. At that time there was a similarly strong concentration in the market. But the financial scientist Paul Marsh can only smile wearily at this – and asks himself three questions.

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