Stock Markets Exposed - What kinds of events causes the stock market (NY,Nasdaq) to go down? What events causes it to go up?

What kinds of events causes the stock market (NY,Nasdaq) to go down? What events causes it to go up?

examples of re-occurrences would be helpful. thanks

Buyers and sellers trade on news, earnings, technical and fundamental analysis and other events where they see opportunity to make money in up or down markets, or exit their position when risk seems too high.
greed causes it to go up. fear causes it to go down.
years ago it used to be that owners of large amounts of stock would buy and sell to play the game of moving it up and down so they could purchase the stock at low prices, sell at high and make a mint. That's against the law now, I believe. They say the economy is no longer tied to the stock market. If that's what you were asking.
It is nothing but gambling on high stake by poor persons and is just entertainment of rich ones.
Eric, I have found some links to websites dealing with this. Some have links to further reading too. I hope they prove useful to you: http://www.investopedia.com/features/crashes/crashes8.asp http://www.lowrisk.com/nasdaq-1929.htm http://econ161.berkeley.edu/movable_type/archives/000772.html http://www.stock-market-crash.net/nasdaq.htm http://query.nytimes.com/gst/abstract.html?res=9F02E4DE113EEF33A2575AC2A9649D946097D6CF http://www.smartcompany.com.au/Premium-Articles/Top-Story/20080804-Investing-in-a-bear-market.html