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Guiscard

(Encyclopedia) Guiscard, Norman rulers in Sicily: see Robert Guiscard; Roger I.

puts and calls

(Encyclopedia) puts and calls, in securities trading. A call is a contract that gives the holder the right to purchase a given stock at a specific price within a designated period of time. It is the…

supply and demand

(Encyclopedia) supply and demand, in classical economics, factors that are said to determine price, by correlating the amount of a given commodity producers hope to sell at a certain price (supply),…

Idrisi

(Encyclopedia) IdrisiIdrisiĭdrēˈsē [key] or EdrisiIdrisiĕ– [key], in full Abu Abdallah Muhammad Ibn Muhammad Ibn Abdallah Ibn Idris Al-Hammudi Al-Hasani Al-Idrisi, b. 1099?, d. after 1154, Arab…