A model is a tool that provides useful outputs to a firm given a set of inputs and can be reused day by day. A spreadsheet with coded probabilistic risk calculation that enables what-if scenarios to be run each day fits this definition perfectly. It is not just a simple spreadsheet, but a complex tool that can process inputs (data entered into the spreadsheet), apply a probabilistic risk calculation (the model's algorithm), and generate useful outputs (the results of the what-if scenarios). These outputs can then be used to make informed decisions about risk management. Furthermore, the fact that this tool can be used day after day, with different inputs, makes it a reusable model, which is a key characteristic of financial models.

Choice A is incorrect. While a spreadsheet that aggregates groups' trading positions for reporting can be a useful tool, it does not necessarily constitute a model in the context of financial risk management. This is because it does not process inputs to generate outputs that can be used in various scenarios, which is an essential characteristic of a model.

Choice B is incorrect. A spreadsheet with what-if calculations for potential buyers may provide valuable insights, but it does not necessarily qualify as a model unless it also includes coded probabilistic risk calculations that enable what-if scenarios to be run each day.

Choice D is incorrect. As explained above, both options B and C do not fully encapsulate the definition of a model in financial risk management context. Only option C meets all the criteria required for something to be considered as a model.

Things to Remember

• Models in financial risk management are tools that provide useful outputs based on a set of inputs and can be reused day by day.
• Models often involve complex algorithms, such as coded probabilistic risk calculations, to process inputs and generate outputs.
• What-if scenarios are a common use of financial models, allowing users to test different scenarios and assess potential outcomes.
• Models should be designed to be reusable, allowing for different inputs to be entered and analyzed on a regular basis.