(Reuters) - The European Central Bank's ultra easy monetary policy may be fuelling asset bubbles, particularly in the real estate market, raising the risk of a correction that could weaken growth, ECB board member Yves Mersch said on Monday."Vigilance is particularly warranted in the light of some signs that monetary policy is encouraging increased risk-taking and contributing to elevated asset price inflation and income inequality," Mersch said in a speech. "The risks of an asset price..