Wall Street secured its best week in four years Friday, rising modestly after a surprise jump in home sales eased concern that frailty in the housing market will hurt economic growth.

The Federal Reserve this week said an “adjustment” in the housing sector was continuing, offering some relief for investors left unnerved by the woes among so-called subprime mortgage lenders. Wall Street had grown concerned that an implosion among subprime lenders, which make loans to people with poor credit, could spill over into other parts of the economy and derail already slowing economic growth.