This document discusses the different types of players in derivative markets: hedgers, speculators, arbitrageurs, and spreaders. It provides examples of how each type of player uses derivatives to reduce risk, earn profits from price fluctuations, or take advantage of temporary pricing differences between markets. The document also summarizes the 1995 collapse of Barings Bank due to massive unauthorized derivative positions taken by trader Nick Leeson that lost over $1.4 billion and bankrupted the institution.