1 These cost between $35 and $55. 2  Keep in mind that an invisible fence doesn't keep other dogs, animals or people out of the yard. 3  The commercial site Dog-Fence-Guide.com provides an overview and links to reviews of various invisible fence products. If living in an area with frequent thunderstorms, consider buying a lightning protector. 2  These cost between $35 and $55. 3  Keep in mind that an invisible fence doesn't keep other dogs, animals or people out of the yard.
Understanding Implied Volatility. In simple terms, implied volatility is the amount of stock price fluctuations. Being on the right side of implied volatility changes can enhance the chances of success. In general, implied volatility increases when the market is bearish and decreases when the market is bullish. This is due to the common belief that bearish markets are more risky than bullish markets. Consider selling strategies when options are being traded at high implied volatility levels.
Volatility terminology [edit]. Volatility as described here refers to the actual current volatility of a financial instrument for a specified period (for example 30 days or 90 days). It is the volatility of a financial instrument based on historical prices over the specified period with the last observation the most recent price. This phrase is used particularly when it is wished to distinguish between the actual current volatility of an instrument.