ORLANDO, Florida, Sept 28 (Reuters) - The 'dollar smile' can be a blessing for Wall Street, or a curse. But the speed and extent of the move in the dollar and Treasuries, and tightening of financial conditions, warrant vigilance. According to Goldman Sachs, U.S. financial conditions are the tightest this year. This is not dissimilar to other major economies and regions, some of which - the euro zone, China and emerging markets - are feeling an even tighter squeeze. It might be too early for that to appear in third-quarter results - many big Wall Street firms will have hedged their currency exposure over the near term - but if sustained, fourth-quarter profits could be affected.

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Persons: Stephen Jen, reckons Stuart Kaiser, Kaiser, Goldman Sachs, Rabobank's Jane Foley, Foley, Jamie McGeever, Andrea Ricci Organizations: Treasury, Citi, FCI, Reuters, Thomson Locations: ORLANDO, Florida, China, U.S, America