1.   A lower yen makes imports, including oil, more expensive in Japan, while making exports cheaper aboard and thus competitive.

2.   A lower yen makes Japanese exports cheaper aboard, and thus more competitive.

3.   A weaker yen tends to make Japanese exports cheaper aboard and thus more competitive, helping to boost earnings of export-led Japanese companies.

4.   A weaker yen tends to make Japanese exports cheaper aboard and thus more competitive.