## Event

**is an abstract direct subtype of Type with functions Quotable Functions, direct subtypes Quotable subtypes and keys Quotable keys that represents the parent Deriscope Type of any Deriscope Object that describes a financial variable.**

*Quotable*Any

**can be in principle evaluated at any time provided sufficient market and model information is available.**

*Quotable*All

**objects contain the function Value.**

*Quotable*Inversely if a type contains the function

**then it must be a subtype of**

*Value***.**

*Quotable*Examples of quotables (i.e. types deriving from

**) are: Stock Price, Ibor Rate, Discount Factor Group etc.**

*Quotable*Note that just as a Tradable is "pricable" but itself does not contain the associated "price", similarly a

**is "valuable" but itself does not contain the associated "value". The "value" is calculated at run time by means of the function**

*Quotable***.**

*Value*For example a Ibor Rate object does not contain the actual "rate value" (e.g. 4%).

It only contains the structural definitions such as Maturity, Frequency, Currency, Daycounts etc.

The "value" (i.e. the associated deposit rate number) can be calculated at run time, if sufficient interest rate market data and modeling assumptions are provided.

Interestingly the "value" that can be assigned to a particular

**may not be just a single number.**

*Quotable*A

**such as**

*Quotable***expects a single number (such as .04) as "value".**

*Ibor Rate*On the other hand the Quotable type

**expects a whole curve (which is mathematically equivalent to an infinite dimensional vector) as associated "value".**

*Discount Factor Group*Often when the observation date lies in the future, the associated "value" is a whole probability distribution (referred as Probability Measure in Deriscope).