 The unemployment rate is 4.2 percent, about half of that in the United States.

 According to skyscraperpage.com, a Web site that tracks major buildings around the world, 81 high-rise buildings taller than 500 feet have been constructed in Tokyo since the “lost decades” began. That compares with 64 in New York, 48 in Chicago, and 7 in Los Angeles.

 Japan’s current account surplus — the widest measure of its trade — totaled $196 billion in 2010, up more than threefold since 1989. By comparison, America’s current account deficit ballooned to $471 billion from $99 billion in that time. Although in the 1990s the conventional wisdom was that as a result of China’s rise Japan would be a major loser and the United States a major winner, it has not turned out that way. Japan has increased its exports to China more than 14-fold since 1989 and Chinese-Japanese bilateral trade remains in broad balance.

As longtime Japan watchers like Ivan P. Hall and Clyde V. Prestowitz Jr. point out, the fallacy of the “lost decades” story is apparent to American visitors the moment they set foot in the country. Typically starting their journeys at such potent symbols of American infrastructural decay as Kennedy or Dulles airports, they land at Japanese airports that have been extensively expanded and modernized in recent years.

William J. Holstein, a prominent Japan watcher since the early 1980s, recently visited the country for the first time in some years. “There’s a dramatic gap between what one reads in the United States and what one sees on the ground in Japan,” he said. “The Japanese are dressed better than Americans. They have the latest cars, including Porsches, Audis, Mercedes-Benzes and all the finest models. I have never seen so many spoiled pets. And the physical infrastructure of the country keeps improving and evolving.”

Why, then, is Japan seen as a loser? On the official gross domestic product numbers, the United States has ostensibly outperformed Japan for many years. But even taking America’s official numbers at face value, the difference has been far narrower than people realize. Adjusted to a per-capita basis (which is the proper way to do this) and measured since 1989, America’s G.D.P. grew by an average of just 1.4 percent a year. Japan’s figure meanwhile was even more anemic — just 1 percent — implying that it underperformed the United States by 0.4 percent a year.

A look at the underlying accounting, however, suggests that, far from underperforming, Japan may have outperformed. For a start, in a little noticed change, United States statisticians in the 1980s embarked on an increasingly aggressive use of the so-called hedonic method of adjusting for inflation, an approach that in the view of many experts artificially boosts a nation’s apparent growth rate.