0534 GMT - Federal Reserve Chairman Kevin Warsh is likely to argue for reducing the Fed's use of forward guidance, which he views as a source of past policy mistakes, Barclays rates strategists say in a note. At the Kansas City Fed's annual symposium at Jackson Hole between Aug. 27 and Aug. 29, Warsh may also provide insights on balance sheet policy, they say. They also expect Warsh to emphasize long-run drivers of the economy, particularly productivity trends and their effects on potential growth. Warsh is unlikely to provide near-term policy guidance, but markets will look for clarity on how the FOMC intends to return inflation to the 2% goal, the strategists say. Warsh is more likely than not to affirm that rate hikes are possible if inflation fails to improve.