Mitä aiemmat pörssiromahdukset opettavat?

Pörssiromahdusten toistuvuus on muistutus kärsivällisyyden tärkeydestä pääomamarkkinoilla, kirjoittaa Morningstarin Paul Kaplan.

Paul D. Kaplan 08.05.2020

The circumstances of the current market crash might be unique to the coronavirus pandemic, but they lead investors to wonder: Are such drops normal for equity markets, or is this different?

During the global financial crisis of 2007–09, some observers described the events that unfolded as a “black swan,” meaning a unique negative event that couldn’t be foreseen because nothing similar had happened before. But the data I’d seen from Ibbotson Associates, a firm that specialized in collecting historical market returns (and which Morningstar acquired in 2006 and merged into Morningstar Investment Management LLC in 2016), demonstrated a long history of market crashes. Some ended up being part of a larger financial crisis.

So, if these “black swan events” happen somewhat regularly—too frequently to render them true black swan events—then what are they? They’re more like “black turkeys,” according to Laurence B. Siegel, the first employee of Ibbotson Associates and now director of research for the CFA Institute Research Foundation. In a 2010 article for the Financial Analysts Journal, he described a black turkey as “an event that is everywhere in the data—it happens all the time—but to which one is willfully blind.”

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