What is a negotiable security and how are they related to derivatives?
The price for securities is negotiable.  You totally have a right to make a lower offer when buying or ask for a higher price when selling.    Securities don't trade at a fixed price, the price goes up and down throughout the day based on the price offers made by buyers and sellers and where they find agreement. If a stock last traded for $10, someone can put out an offer to buy the stock at $9.50, if they find someone who wants to sell and will accept that price, then a deal is made. unless something is falling rapidly in price however, an offer that far below the last price is not terribly likely to be accepted. Now if you want to be assured of making a sale or purchase, you generally trade 'at the market' and for small time players that is very much encouraged as it makes it easier for everyone.