Goodwill is an intangible asset in the balance sheet of a company not related to anything that can be described, measured or sold. Typically it represents the accumulated value of past acquisitions. Please also see our article on "Goodwill - very bad at bad times"
Great Depression
In economic context, a term used for the period between 1929 and the following 5-15 years (depending on country), showing a massive contraction of economic output, high unemployment and other signs of economic stress for individuals and companies. There is no exact definition of 'depression' in economic terms, contrary to 'recession', which has a clear definition accepted by most scientists.
Gross Domestic Product (GDP)
GDP is one of the key measures for a country's economic output, measuring the total value of all goods and services produced. It is typically calculated as the sum of consumption, (gross) investment plus government spending and the trade balance (exports minus imports) of a country.