WASHINGTON (Reuters) - U.S. lawmakers will question some leading government and industry economists about the perils of a possible 'housing bubble' in a Wednesday hearing. Lawmakers wanted the session "because we've heard a great deal about the possibility of a housing bubble for several years now," said Sen. Wayne Allard, a Republican from Colorado. The hearing, "The Housing Bubble and its Implications for the Economy," will be held in an open session of the Senate Banking Committee at 10 a.m.. Next week, the same committee will hold a hearing on the growth of innovative mortgage products that have mushroomed along...