If lenders used the seemingly sensible underwriting standards that were in place in 2001, some 1.2 million more mortgages would have been originated in 2014, according to estimates by the Urban Institute’s Housing Finance Policy Center. Laurie Goodman, director of the HFPC, said lenders have “plenty of room to safely ease credit.” An underwriting index from the HFPC suggests that originators are accepting little risk in terms of borrower or loan characteristics, hindering a recovery in the mortgage market and the broader economy. Lenders note...