I wish the economy wasn't so bad, I cant find work anywhere.
Well,we may call that a downward economy, recession or depression
The great depression was generally believed to be caused by very specific economic events.
Economic events could be what,it viewed by different economic thought ,like the classicals or Keynesians
Keynesian ecomincs is a bery interesting topic, it puts much more nuance on the ecomomy than just "Supply and Demand."
Yeah ,its emphasis was on inflationary trend as against the monetary policy of which the classical base their thought on
price index, over time. The opposite of inflation is deflation, a sustained decrease in the general price level of goods and services. 
Inflation affects economies in various positive and negative ways. The negative effects of inflation include an increase in the opportunity cost of holding money, uncertainty over future inflation which may discourage investment and savings, and if inflation were rapid enough, shortages of goods as consumers begin hoarding out of concern that prices will increase in the future. Positive effects include reducing unemployment due to nominal wage rigidity,
Under these assumptions, Say's law implies that there cannot be a general glut, so that a persistent state cannot exist in which demand is generally less than productive capacity and high unemployment results. Keynesians therefore argued that the Great Depression demonstrated that Say's law is incorrect. Keynes, in his "General Theory", argued that a country could go into a recession because of "lack of aggregate demand".
Because historically there have been many persistent economic crises, one may reject one or more of