greenspan apparently said to reuters overnight - 'that the yen carry trade cannot last forever and it has to end at some point'. a few points here. (1) greenspan never said much before when he was chairman - fact. (2) he is now more vocal than he has ever been - fact why? (3) would he have thought this when he was chairman but never publicly said it? probably yes. (4) the point of saying it now - not paid to be a civil servant anymore so you do not have to tow the party line. (5) what is to be gained from this? - cleaner conscience, the i told you so approach, different view from the fed, recognition that he is not over the hill etc. (6) scaremongering - probably not.greenspan is an intelligent guy.no reason to scaremonher. conclusion - definite problem reckonised by someone with expertees who can see real danger for the us economy/world economy if this trade implodes and can speak publicly about it much to the annoyance of the authorities.