# Friday the 13th-effect

- Canonical URL: https://www.gerhardmerk.de/friday-the-13th-effect
- Post ID: 589978
- Modified: 2023-07-25T21:01:45+00:00
- Language: en

## Definition

The claim, repeatedly made in many publications, that - even worldwide - stock market prices would fall if the thirteenth day of the month were a Friday. Exact statistical measurements have clearly disproved this statement (it could be clearly demonstrated by exact statistical research that this is not the case). - See January effect, Halloween rule, calendar effect, Monday effect, sell-in-May effect, Friday, black, small-cap effect. Attention: The financial encyclopedia is protected by copyright and may only be used for private purposes without express consent! 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/

## Machine-readable

- Generator: Merk Knowledge 1.1.1