My understanding:
Don't forget short selling:
http://en.wikipedia.org/wiki/Short_selling
tl;dr version: You get money by buying high and selling low.
During the current stock market crash, many people lost a ton of money. But others who understood the housing bubble bet against the market and used short selling. They made
billions of dollars. For example George Soros came out of retirement just to short sell and make ~3
billion dollars.
In more contemporary terms, the Casino Royale Bond Villain's shtick was basically short selling.
Also, many stocks are automated to sell off if they dip below a predefined value, usually in the last hour of trading. As a result, you get cascading sell offs.
All these reasons are why the stock market has been so volatile over the last weeks. The system rewards and reinforces instability, especially when confidence oscillates because of uncertain governmental investments worth 700+ billion dollars. If the government was actually competent, and had contingency plans, the current financial crisis would be much less dire.
The goal of all this speculation is merely to game wealth out of the system. Like a casino. That's what Day trading is.
However, in the current situation, this is an example of what happens:
1. Company sells a stock share for 20 dollars.
2. Stock rises, gets sold back and forth between investors.
3. The stock rises to 100 dollars, and subsequently crashes to 10 dollars.
3b. It is important to note that nothing has changed within the company. It still produces products, and it is still as fiscally viable as when it was selling at 100 dollars a share.
4. In reality, those 90 dollars per share, just
no longer exist.
5. Final step: repeat the above, to a lesser or greater degree, on a global scale.
Compared to one year ago, the world has the same production capabilities to produce goods. The world has the same ability to provide services. However, our financial system is based upon bullshit voodoo confidences which make money appear and disappear out of nowhere. So now the world has much less money to buy things (and lending to buy things).
So the world might be declining into a second Great Depression with lower standards of living across the board, purely because of our financial system, and not because we can't produce and distribute products to people.
That's how we do things. IN AMERICA! (And by extension, influencing the rest of the world).
There is nothing worse than aggressive stupidity.
- Johann Wolfgang von Goethe