A market participant who tries to profit from buying and selling futures and options contracts by anticipating future price movements. Speculators assume market price risk and add liquidity and capital to the futures markets.
Rule number one : most things will prove to be cyclical
Rule number two : some of the greatest opportunities for gain and loss come when other people forget rule number one
The difference between the high and low price of a products such as stocks, commodities, foreign currencies etc are bought and sold in market on given trading session, week, month, year, etc.