An increase in the purchase-mortgage share in new jumbo mortgage-backed securities will benefit investors in the deals, according to Moody's Investors Service. However, the loans are more difficult for lenders to originate than refinance mortgages, and it remains to be seen if investor demand will be high enough to prompt issuance of jumbo MBS. The share of refis in jumbo MBS declined as interest rates rose in 2013. Moody's said the trend is expected to continue this year and noted that ...