Corporate Japan's gumption is evident in the way it has navigated the tests of the past couple of years. That doesn't mean the country's army of salary(wo)men can celebrate. There's not much their companies can do to strengthen further. With limited room for further improvement in their creditworthiness, Japanese corporations will rely over the next one to two years on a steady domestic economy and their strong financial positions for support. However, geopolitical tensions, inflation, a global economy in the doldrums, and extensive investments by management teams hungry for growth could all throw spanners in the works.