Corporate Japan is starting to wonder if the weak yen has become too much of a good thing.
The currency fell to a 34-year low on Monday and has lost about a quarter of its value against the surging U.S. dollar in a little more than two years.
Typically, a weak yen is seen as a boon for Japan Inc., as it makes cars and other goods cheaper overseas and lifts profits when earnings from abroad are brought home.
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