Japanese stocks are cruising at their highest levels in 33 years. (Photo by Hirofumi Yamamoto)

TOKYO — The strength of Japan’s stock market and the weakness of its currency are feeding off each other in a way that is different from past rallies and could widen movements on both sides.

The Nikkei Stock Average is hovering at a 33-year high of around 30,800, climbing nearly 2,000 points this month alone.

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