Particularly in the last days of the Tokugawa shogunate, when Japan opened itself to the West and concluded the Ansei Treaties (a series of treaties signed in 1858 [during the Ansei era], with the United States, Great Britain, Russia, Netherlands and France on the others), the export of raw silk and tea became active, and this caused the surge of the prices of commodities.
特に幕末に日本が開国して安政条約が締結されると、生糸や茶の輸出が盛んになり、その分物価が急上昇した。