Banks now offer lower rates on smaller mortgages—a sign of investors clamoring for safe assets amid the coronavirus recession

Record-low interest rates are helping home buyers lock in years of savings on future mortgage payments. But those searching for larger homes or in expensive markets arent reaping the same rewards.
The average rate on a 30-year jumbo mortgage was 3.77% in mid-July, more than 0.4 percentage point above the average rate on smaller, conforming loans, according to Bankrate.com, a personal-finance website. From mid-2015 until this spring, jumbo rates had been consistently lower than or equal to the rates on conforming loans.