Strains evident in the housing finance system on the eve of the 80's suggest significant difficulties in meeting the housing demands of the decade ahead. The annual increase in residential mortgages outstanding had climbed to historic levels, relative to GNP, without raising residential construction spending above its ordinary share of GNP. This very weak housing bang for the mortgage buck is traceable, ultimately, to the soaring volume of sales in the used home market, relative to those in the new home market. With significant inflation rates continuing through the 1980's, mortgage lenders will be under great pressure from demands to refinance the existing housing stock, even if the rate of ownership turnover does not persist at the levels of the late 70's. And, as the dollar demands mount, for new and used housing purchases, lenders may find repayment flows from earlier loans continuing to provide a historically small fraction of the funds they need in supplying these demands.