Japan’s Stimulus is a Lesson

HAMADA, Japan — The Hamada Marine Bridge soars majestically over this small fishing harbor, so much larger than the squid boats anchored below that it seems out of place.

And it is not just the bridge. Two decades of generous public works spending have showered this city of 61,000 mostly graying residents with a highway, a two-lane bypass, a university, a prison, a children’s art museum, the Sun Village Hamada sports center, a bright red welcome center, a ski resort and an aquarium featuring three ring-blowing Beluga whales.

Nor is this remote port in western Japan unusual. Japan’s rural areas have been paved over and filled in with roads, dams and other big infrastructure projects, the legacy of trillions of dollars spent to lift the economy from a severe downturn caused by the bursting of a real estate bubble in the late 1980s. During those nearly two decades, Japan accumulated the largest public debt in the developed world — totaling 180 percent of its $5.5 trillion economy — while failing to generate a convincing recovery.

Now, as the Obama administration embarks on a similar path, proposing to spend more than $820 billion to stimulate the sagging American economy, many economists are taking a fresh look at Japan’s troubled experience. While Japan is not exactly comparable to the United States — especially as a late developer with a history of heavy state investment in infrastructure — economists say it can still offer important lessons about the pitfalls, and chances for success, of a stimulus package in an advanced economy.

In a nutshell, Japan’s experience suggests that infrastructure spending, while a blunt instrument, can help revive a developed economy, say many economists and one very important American official: Treasury Secretary Timothy F. Geithner, who was a young financial attaché in Japan during the collapse and subsequent doldrums. One lesson Mr. Geithner has said he took away from that experience is that spending must come in quick, massive doses, and be continued until recovery takes firm root.

Moreover, it matters what gets built: Japan spent too much on increasingly wasteful roads and bridges, and not enough in areas like education and social services, which studies show deliver more bang for the buck than infrastructure spending.

“It is not enough just to hire workers to dig holes and then fill them in again,” said Toshihiro Ihori, an economics professor at the University of Tokyo. “One lesson from Japan is that public works get the best results when they create something useful for the future.”