The Sierra Club, with over 700,000 members nationwide, is the oldest grassroots environmental organization in the United States. It sees its purpose as preservation, protection, and enhancement of the natural environment.
Article IV, Section 4. This section is called the Guarantee Clause, because by its terms the federal government makes certain guarantees to the states. One of theseâprotection from foreign invasionâcontinued Congress's prior obligation under the Articles of Confederation.
Implied Volatility Rank â IV Rank. Implied volatility (IV) is a forward-looking expectation of price fluctuation. This is derived from an option pricing model and carries great importance in the pricing of options. However, due to multiple inputs in option pricing models, IV can (and typically does) constantly fluctuate.