The value of the dollar has decreased to 155 yen. This change is attributed to hopes that the interest rate gap between the US and Japan will narrow.

Further information on this development is available from the source. The source publication, 毎日新聞, has reported on the dollar's fall to 155 yen.

Details of the circumstances surrounding the decrease in the dollar's value are limited, but the source may provide additional context and insights into the potential narrowing of the US-Japan interest rate gap.