The Japanese monetary authority intervenes into the foreign exchange market on and off. The influence of the operations on the fluctuation of the yen exchange rate to U.S. dollar is examined in the period of September 17 through 28, 2001. A cyclic behavior is found in correlation functions of...

The economic structural change in the data of the yen exchange rates to US dollar and to euro is investigated. We analyse the distribution of the residuals which are the differences between the smoothed and original data. The probability density function is well approximated by the Gram-Charlier...

Fluctuations of yen exchange rate to US-dollar are analyzed by a method of classical mechanics. The fluctuations are explained by a linear inhomogeneous differential equation of the second order with a constant coefficient. The inhomogeneous term is an external force. Using a method of the least...

This articles presents and application of statistical physics to economic relationships, based on the fluctuation-dissipation theorem and the anomalous fluctuation therorem, and the Langevin equation. In the framework of time series which follow the Langevin equation, the interaction of two time...