Business and Personal Finance Dictionary

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• CALENDAR SPREAD
  
  An option trading strategy that involves buying two calls or two puts on the same underlying, but with different maturity dates. If two call options are used, the spread may be referred to as a calendar call spread. Similarly, if two put options are used, the spread may be described as a calendar put spread. When the exercise price of the two options is the same, the calendar spread is described as a horizontal spread. When the exercise price of the two options is different, the calendar spread is described as a diagonal spread.
  
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