交換 こうかん貿易 ぼうえき せいではありませんでした
kōkambōekiseidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 交換貿易制

1. Was not barter.; Was not a system of exchange.

Past/Perfective
Negative
Polite
Formal Register