Boom and bust in the housing market a This credit and house price explosion led to a building boom and a surplus of unsold homes n Adjustable-rate mortgages(aRm) enticed borrowers with a below market interest rate for some predetermined period followed by market interest rates for the remainder of the mortgage's termBoom and bust in the housing mar ket  This credit and house price explosion led to a building boom and a surplus of unsold homes.  Ad justable-rate mort g ga ges ( ) ARM ) enticed borrowers with a below market interest rate for some p p redetermined period, followed by market interest rates for the remainder of the mort g ga ge's term