空洞 くうどう 現象 げんしょうじゃありませんでした
kūdōkagen shōja arimasendeshita

Noun
Desu Copula

The polite, past negative form of 空洞化現象

1. It wasn't hollowing out.; It wasn't becoming hollow.

Past/Perfective
Negative
Polite
Terminal Form
Economics