Aussie dollar up on hopes of U.S.-China trade deal, sterling surges on Brexit deal hopes

LONDON (Reuters) - The Australian dollar and Chinese yuan, often seen as barometers of investor risk appetite, rose Friday on hopes of progress in U.S.-China trade talks, while optimistic comments about the prospects of a possible Brexit divorce deal boosted sterling.Top U.S. and Chinese negotiators wrapped up their first day of trade talks on Thursday, with U.S. President Donald Trump welcoming what he called a "very, very good negotiation with China". Business groups expressed optimism the two..