The economy will have an influence on mortgage rates prior to locking and protecting a mortgage interest rate; however, once the rate is protected there is no affect on a fixed-rate mortgages. By law, the terms of the securitized note cannot change once the loan has closed. Conversely, mortgages with adjustable rates can be affected by economic ups and downs as those rates are subject to change even after the closing of the loan. Visit our What Determines Mortgage Rates page for more information on this topic.