Breakdown of kakakukoushou ga hajimatta.

Questions & Answers about kakakukoushou ga hajimatta.
It is read:
かかくこうしょう が はじまった。
Word by word:
- 価格 = かかく = price
- 交渉 = こうしょう = negotiation
- 価格交渉 = かかくこうしょう = price negotiation
- 始まった = はじまった = started / began
It is a compound noun made from two nouns:
- 価格 = price
- 交渉 = negotiation
Together, 価格交渉 means price negotiation or price negotiations.
This is very common in Japanese: two nouns are combined into one larger noun. So in this sentence, 価格交渉 acts as a single noun phrase.