1.   Boosting the dollar further against the yen was yen weakness against the mark, since many mark-yen transactions go through the U.S. currency.

2.   Deputy U.S. Treasury Secretary Lawrence Summers also said he was concerned about yen weakness.

3.   The turmoil roiling Southeast Asian stocks, bonds and currencies will take a toll on the Japanese economy and contribute to further yen weakness, analysts and traders said.

4.   Yen weakness decreases returns to overseas investors who convert bond income into other currencies.

5.   Yen weakness was also visible elsewhere.

6.   Yen weakness also means import prices may rise, lifting the weight of falling prices -- or deflation -- from the economy.

7.   Yen weakness may be the spoiler for bonds in the coming week as it was today.

8.   Yen weakness was also reflected in non-dollar trading.

9.   Yen weakness can aid the economy by making Japanese exports less expensive.

10.   Yen weakness makes yen-denominated debt less attractive relative to securities denominated in appreciating currencies.