a1 Professor, School of Economics and Finance, Yeungnam University, Dae-dong 214-1, Kyungsan, 712-749, South Korea. E-mail: firstname.lastname@example.org.
I gratefully acknowledge the financial support from Korea Research Foundation (KRF-2007-322-B00010). I have benefitted from discussion with Woo Youn Lee and other participants in the Historical Statistics of Korea project at the Naksungdae Institute of Economic Research. This comment does not represent the official view of the institute, and all remaining errors are mine.