Yen's Strength Challenges Conventional Wisdom on Japan Stocks

The Japanese yen has reached its strongest level since May, climbing above ¥155.6 to the US dollar. This move is causing investors and strategists to re-examine their assumptions about the relationship between a weak yen and Japanese stocks.

For years, it was believed that a weaker yen would automatically boost the earnings of Japan's exporters and manufacturers, leading to higher stock prices. However, several strategists now argue that this assumption needs to be rethought.

UBS SuMi TRUST's Chisa Kobayashi notes that while a weak yen does help earnings when considering only exchange rates, an excessive or rapid decline in the yen can raise concerns about downward pressure on valuations. This is because a weaker yen can feed inflation and push up interest rates, outweighing any currency-linked earnings boost.

Mitsui Sumitomo Insurance's Eiji Sato agrees that this may be a turning point where the weak-yen-helps-stocks view needs to change, adding that companies need to use the cash generated from a weak yen to genuinely enhance corporate value, something few have done so far.