Unmeasured investment and the puzzling lost decades of the Japanese economy

For the mid to late 1990s and early 2000s, the basic neoclassical growth theory predicts a
steady Japanese economy, when in fact the Japanese economy was depressed. This study
applies the new theory with intangible investment and non-neutral technology proposed by
McGrattan & Prescott (2010) to the Japanese economy, and finds that the predictions derived
from the new theory are much closer to the actual data. The improvement of this extension
remains robust when tangible investment adjustment costs are added. This study is the first to
apply the new theory to a country other than the US, and compared with existing literature on the
lost decades of Japan, this study better explains the depression in labour hours by avoiding
introducing a large, unjustified labour wedge or other exogenous inputs.