Key Industries
Industries of primary importance to a nation’s economy such as the military or automobile industry.
Keynesian Economics
An economic school of thought originated by British economist John Maynard Keynes, which states that active government intervention in the marketplace is the only method of ensuring economic stability and prosperity. The key component is that the government can affect the laws of supply and demand, by artificially increasing demand when it is low, and manipulating demand when it leads to inflation. Keynesian economics favors high government spending to avoid a depression.
http://www.truveo.com/Keynesian-Economics/id/4029107073