Explain Why Gamma Increases as an Option Approaches Expiration.

Gamma increases near expiration because the option's sensitivity to price changes becomes highly magnified. As the option gets closer to expiration, a small move in the underlying asset's price can determine whether the option expires worthless or deep in-the-money.

This 'all-or-nothing' effect causes the Delta to change very rapidly, which is the definition of high Gamma.

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