空洞 くうどう 現象 げんしょうじゃなかったです
kūdōkagen shōjanakattadesu

Noun
Desu Copula

The polite, past negative form of 空洞化現象

1. It wasn't hollowing out.; It wasn't the hollowing-out phenomenon.

Past/Perfective
Negative
Polite
Casual Register
Economics