2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/208751For the purpose of elucidating the correlation among currencies, we analyze daily and high-resolution data of foreign exchange rates. There is strong correlation for pairs of currencies of geographically near countries. We show that there is a time delay of order less than a minute between two currency markets having a strong cross-correlation. The cross-correlation between exchange rates is lower in shorter time scale in any case. As a corollary we notice a kind of contradiction that the direct Yen-Dollar rate significantly differs from the indirect Yen-Dollar rate through Euro in short time scales. This result shows the existence of arbitrage opportunity among currency exchange markets.6 pages, 5 figures, 1 tableStatistical MechanicsStatistical Financetext