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+CEP 30 - Framework for Financial Parameter Exchange in the CYCLUS R-I-F Hierarchy
+*********************************************************
+
+:CEP: 30
+:Title: Framework for Financial Parameter Exchange in the CYCLUS R-I-F Hierarchy
+:Last-Modified: 2024-12-27
+:Author: Dean Krueger <dean.krueger@wisc.edu>
+:BDFP: Paul Wilson
+:Status: Draft
+:Type: Standards Track
+:Created: 2024-11-26
+:Cyclus-Version: 1.6.0
+
+
+Abstract
+========
+
+The DRE of the current version of CYCLUS handles the cost of materials being traded in a 
+way which was always intended to be expanded upon as discussed in the Supply-Demand 
+Framework section of [CEP 18](https://fuelcycle.org/cep/cep18.html). In particular, that CEP 
+suggests that the introduction of economic concepts could allow the supplier to have more
+influence over the preferences of particular trading paths. As a part 
+of moving the DRE in that direction, it is necessary to add economic parameters to  
+the definitions of the Region, Institution, and Facility in such a way as to allow them 
+to interact with each other to combine these parameters in meaningful ways. The proposal 
+for doing so is to add sub-classes 
+to each which will act as a method of communicating economic information between layers 
+of the simulation.
+
+Copyright:
+==============================
+
+CEP 30 will be placed in the public domain as required by CEP 1.
+
+Specification:
+============================
+
+The new feature being proposed is a subclass for each of the Region, Institution, and 
+Facility classes which will allow the communication of economic/financial data between each layer 
+of the CYCLUS Region-Institution-Facility hierarchy. The main feature of the subclass will be a hash table 
+(enabled by std::unordered_map) which contains pairs of keys (std::string) and values 
+(doubles), as well as functions to set and get elements in the table. 
+
+Motivation:
+==================
+
+The major motivation for this new feature is that currently when a Facility tries to access 
+information about its Institution, it can only reliably use the public API of the Institution 
+base class. That is, it is dangerous to try to access something that is only in the public 
+API of a derived Institution archetype because it may not always be there. 
+This eliminates the use of the optional Toolkit to introduce economic/financial parameters 
+into agents that are required to interact for those parameters since C++ doesn't provide
+a way to interrogate the API of an agent.
+Because of the 
+interdependence of imagined economic functionality on the Region-Institution-Facility
+relationship (a facility’s cost may be impacted by its own capital cost, as well as its 
+parent institution’s minimum acceptable rate of return and the regional tax rate, for 
+instance), the ability of a facility to access information about its parent Agents is 
+crucial.
+
+Rationale:
+===========================
+
+Implementing the overall feature as a subclass keeps it in line with the class-subclass 
+structure of other CYCLUS functionality, such as the `TimeAgent` or `Trader` features that are inherited this way.
+The reasons for choosing a hash table over another data structure are that they allow quick and 
+easy expansion both by developers and within the simulation itself, as well as search, insert, and 
+delete operations being ostensibly O(1). 
+
+During the public vetting stage of CEP 30’s lifecycle two alternative ideas for implementing this 
+behavior were proposed. The first was to use the code injection functionality of cycpp files to 
+add economic information as an optional Toolkit feature to archetypes themselves at the beginning 
+of simulations. This was tested, but it was discovered that there were problems accessing the 
+information of parent agents, and it was determined that this approach would be some combination 
+of too cumbersome and less certain to work. Eventually, the toolkit approach will likely be used 
+in conjunction with the features added by this CEP. The second idea was to implement some sort of 
+registry, but this was deemed to be too much of a bloat hazard, as registries can become very 
+complicated very quickly.
+
+Backwards Compatibility:
+===========================
+
+Since this feature is proposed as a subclass of each of the three agent subclasses, it will be 
+optional to use, and therefore entirely possible to completely ignore it. This means it should 
+require no work to ensure backwards compatibility with older versions of CYCLUS.