As the first Asian country to achieve the developed economy label, Japan has worn the badge for decades with as much pride as it has shown its terror at losing it. However absurd or remote, the idea of that happening has elbowed itself a place in public discourse, often as a motivational tool. The sustained battering of the yen since January, along with the excitement that has encouraged speculators and the government intervention apparently triggered on Monday, has led some to declare the situation a currency crisis. Some have invoked the idea that this exposes emerging economy-like vulnerabilities in Japan. Foreign tourists turning up in record numbers and declaring on social media how cheap the place feels may have added to a sense of accelerated diminishment.