What happened when soccer matches stopped having fans in the stands during the current pandemic?

Referees stopped issuing so many yellow cards to the visiting team.

https://www.iza.org/publications/dp/13578/experimental-effects-of-an-absent-crowd-on-performances-and-refereeing-decisions-during-covid-19
What happened when soccer matches stopped having fans in the stands during the current pandemic?Referees stopped issuing so many yellow cards to the visiting team. https://www.iza.org/publications/dp/13578/experimental-effects-of-an-absent-crowd-on-performances-and-refereeing-decisions-during-covid-19
What happened when soccer matches stopped having fans in the stands during the current pandemic?Referees stopped issuing so many yellow cards to the visiting team. https://www.iza.org/publications/dp/13578/experimental-effects-of-an-absent-crowd-on-performances-and-refereeing-decisions-during-covid-19
What happened when soccer matches stopped having fans in the stands during the current pandemic?Referees stopped issuing so many yellow cards to the visiting team. https://www.iza.org/publications/dp/13578/experimental-effects-of-an-absent-crowd-on-performances-and-refereeing-decisions-during-covid-19
What happened when soccer matches stopped having fans in the stands during the current pandemic?Referees stopped issuing so many yellow cards to the visiting team. https://www.iza.org/publications/dp/13578/experimental-effects-of-an-absent-crowd-on-performances-and-refereeing-decisions-during-covid-19
See also:

https://twitter.com/th_alys/status/1293585161850945536

and https://twitter.com/Grady214/status/1293584494423752706
https://twitter.com/csingletonecon/status/1293611872537772032
See also...
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