5. What is a stock index future? How can a stock index future be used to obtain a synthetic position in the underlying index?

Essentials Of Investments
11th Edition
ISBN:9781260013924
Author:Bodie, Zvi, Kane, Alex, MARCUS, Alan J.
Publisher:Bodie, Zvi, Kane, Alex, MARCUS, Alan J.
Chapter1: Investments: Background And Issues
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can you help to explain the concept of synthetic position. 

5. What is a stock index future? How can a stock index future be used to obtain a synthetic
position in the underlying index?
Transcribed Image Text:5. What is a stock index future? How can a stock index future be used to obtain a synthetic position in the underlying index?
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A stock index future is an agreement to purchase or sell stocks on a future date at a specific price.

A synthetic option is a way of recreating the payoff and risk profile of a particular option using combinations of the underlying instrument along with different options.

Synthetic options are created through the concept of put-call parity implicit in options pricing models. This implies that holding a short put along with a long call of the same class will deliver the same return as holding the same underlying  with a price equal to the option's strike price. 

Large institutional investors can replicate a well-diversified portfolio of common stock by holding

  • A long position in the stock index futures contract as well as
  • Satisfying the margin requirement with T-bills

The resulting portfolio is a synthetic index portfolio.

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