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買えばいい

should buy

→ 買う
phrase Uncommon #18,050
should buy Used to give or ask for mild advice about buying something. In context, it can also mean “could just buy.”
JA: 分からなかったら、店員さんに聞いて買えばいいよ。
EN: If you’re not sure, you can ask a store clerk and buy it.

彼の誕生日に何を買えばいいのかわからない。

I don’t know what to buy him for his birthday.

フライとピザを両方買えばいいさ

You could just buy both fries and pizza.

— 恋する惑星 (1994)

鉛筆は、あと何本買えばいい？

How many more pencils do I need to buy?

どこで切符を買えばいいのか教えてくれませんか。

Could you tell me where I can buy a ticket?

サラダとフライを両方買えばいい

You should buy both the salad and the fries.

— 恋する惑星 (1994)

レコードでも買えばいいわ

You could always buy the record.

— キャッチ・ミー・イフ・ユー・キャン (2002)