In relation to the financial market, the assumption that correlations and volatilities of financial market products are basically constant over time. At the latest since the subprime crisis, this assumption – which was implicit in many mathematical models of financial theory and in some cases still is to this day – has proven to be fallacious. – See Elizabeth Question, Financial Market Models.
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University Professor Dr. Gerhard Merk, Dipl.rer.pol., Dipl.rer.oec.
Professor Dr. Eckehard Krah, Dipl.rer.pol.
E-mail address: info@ekrah.com
https://de.wikipedia.org/wiki/Gerhard_Ernst_Merk
https://www.jung-stilling-gesellschaft.de/merk/
https://www.gerhardmerk.de/