Why does there tend to be a cyclical nature with most implied volatility charts? Consider the AMZN chart below: (poll 2189449)

Why does there tend to be a cyclical nature with most implied volatility charts? Consider the AMZN chart below:

Institutions buy options at certain times of the year to hedge their portfolios

Quarterly earnings announcements

Those pesky market makers are artificially changing option prices!

What the heck is implied volatility?

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