Primary factors believed to have led to the recession include the following: restrictive monetary policy enacted by central banks, primarily in response to inflation concerns, the loss of consumer and business confidence as a result of the 1990 oil price shock, the end of the Cold War and the subsequent decrease in defense spending, the savings and loan crisis and a slump in office construction resulting from overbuilding during the 1980s. The US economy returned to 1980s level growth by 1993 and global GDP growth by 1994.