Using tick-by-tick data of the dollar-yen and euro-dollar exchange rates recorded in the actual transaction platform, a quot;runquot; -- continuous increases or decreases in deal prices for the past several ticks -- does have some predictable information on the direction of the next price...

Using the "firm" quotes obtained from the tick-by-tick EBS (electronic broking system that is a major trading platform for foreign exchanges) data, it is found that risk-free arbitrage opportunities--free lunch--do occur in the foreign exchange markets, but it typically last only a few seconds....