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This exercise is to model a pensions system. # This exercise is to model a pensions system.
## original text from the client (named ACME) ## original text from the client (named ACME)
ACME operates a Master Trust Pension. A ACME pension consist of units of Assets held on behalf of the member. These units, and any associated cash, are recorded in an internal ledger. The actual units of each asset are aggregated into a single holding held by an external Asset Custodian on behalf of ACME. ACME operates a Master Trust Pension. A ACME pension consist of units of Assets held on behalf of the member. These units, and any associated cash, are recorded in an internal ledger. The actual units of each asset are aggregated into a single holding held by an external Asset Custodian on behalf of ACME.
Asset units are bought and sold on behalf of members. The process of buying and selling assets takes several days trades are only placed periodically and take several days to settle. Asset units are bought and sold on behalf of members. The process of buying and selling assets takes several days trades are only placed periodically and take several days to settle.
The basic process for buying assets is: The basic process for buying assets is:
(TODO mermaid)
```mermaid
flowchart TD
member([Member])-- Invest cash -->create_buy_trade
create_buy_trade[Create buy trade]-->aggregate
aggregate[Aggregate into an external buy trade]-.->external_buy_trade
external_buy_trade[Place an external buy trade]-->buy_assets
buy_assets[Buy assets]-->custodian
custodian([Asset custodian]) -. Trade priced .-> move_to_pots1
custodian -. Trade settled .-> move_to_pots2
move_to_pots1[Move assets to pots]-->move_cash_to_custodian
move_cash_to_custodian[Move cash from pots to custodian account]
move_to_pots2[Move assets to pots]
```
> Dotted arrow is delayed operation
> Round shape indicates an actor
The platform is intended to support up to 5 million members. The following are the meanings of terms used by ACME: The platform is intended to support up to 5 million members. The following are the meanings of terms used by ACME:
• Internal Account - a logical account within the internal ledger that records the holding of an amount of cash or units of assets • Internal Account - a logical account within the internal ledger that records the holding of an amount of cash or units of assets
• Pot - a collection of Internal Accounts that belong to a Member, ACME, an external body, e.g. an Asset Custodian • Pot - a collection of Internal Accounts that belong to a Member, ACME, an external body, e.g. an Asset Custodian