Morgan Stanley client note (via Bloomberg) - in brief
AUD vulnerable to
- slowing economy
 - threats to international trade
 - rising U.S. funding costs
 - neutral positioning on AUD means further selling will have impact
 
USD
- should be supported by robust US growth
 - Positive earnings momentum
 - Growth, trade concerns may weigh on investment and liability flows from the US, leading to USD strength
 
MS trade reco:
Short AUD/USD at 0.7770
- target 0.6900
 - stop 0.7910
 
Risk to the trade is that global funding flows accelerate, leading to USD weakness
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Some interesting and different slant on things there from MS. The sell point on AUD/USD is way away too.