You seem to believe that the world economy is a zero-sum game. This is emphatically false. In this case, certainly the whole world would benefit even if a bett

You seem to believe that the world economy is a zero-sum game. This is emphatically false. In this case, certainly the whole world would benefit even if a better solar energy technology (conventional or outer space) were invented. The polio vaccine helped the whole world; the reason that most of the revenue from it came to the USA is that the rest of the world thought that having those shots was more important than giving up their money. And in economic terms, if tilting the economies of scale makes Japan a better manufacturer of solar power tech, then the law of comparative advantage allows other countries to benefit from supplying the goods that Japan will shift away from as it moves resources to the solar tech.