Rudi Dornbusch's 'overshooting' model…. Invisible bond vigilantes. Suppose… they suddenly demand that Japanese 10-year bonds offer a rate of return 200 basis points higher than US 10-year bonds.

Shachihata, a well-known stamp maker in Japan, hinted it might be able to help to develop the product, and after three months the company revealed trial sales for its first model.

A new device aimed at tackling sexual harassment on crowded trains and public transport has sold out just half an hour after it went on sale in Japan.