Usually powertrain is used to refer to simply the engine and transmission, including the other components only if they are integral to the transmission. A motor vehicle's driveline or drivetrain consists of the parts of the powertrain excluding the engine and transmission. It is the portion of a vehicle, after the transmission, that changes depending on whether a vehicle is front-wheel, rear-wheel, or four-wheel drive, or less-common six-wheel or eight-wheel drive.
The Great Recessionâwhich officially lasted from December 2007 to June 2009âbegan with the bursting of an 8 trillion dollar housing bubble. The resulting loss of wealth led to sharp cutbacks in consumer spending.
Many factors directly and indirectly caused the Great Recession (which started in 2007 with the US subprime mortgage crisis), with experts placing different weights upon particular causes.here are several narratives attempting to place the causes of the crisis into context, with overlapping elements. Five such narratives include: 1  There was the equivalent of a bank run on the shadow banking system, which includes investment banks and other non-depository financial entities.