With its tradition of a job for life for most citizens, Japan once had a much lower unemployment rate than that of the United States; from 1960 to $1995,$ the unemployment rate in Japan exceeded $3 \%$ only once. However, since the crash of its stock market in 1989 and slow economic growth in the 1990 s, the job-for-life system has broken down and unemployment has risen to more than $5 \%$ in $2003 .$ Explain the likely effect of these recent changes in Japan on the Japanese natural rate of unemployment.