Add the following location to Locations:

Name: Open-air markets
Population Size: 3
Description: Throngs of people gather here, perhaps more than in any other settlement.
Prerequisite: The Demiurge journeying to this location must have a non-zero amount of Macca.

Add the following text to Post-Extinction Capitalism:

Every item definition in Items has a publicly tracked cost (defaulting to 100,000), and a publicly tracked list of Shops (defaulting to Open-air markets if that exists as a location, or to Lost and Alone if it does not).

At any time, the Omnipotence may add or remove a location from any item definition’s list of shops. All item definitions must have at least 1 valid location in that item definition’s list of shop otherwise the list reverts to the default.

At any time, a Demiurge may Make a Purchase, which is the following atomic action:
*They choose an item definition which has the Demiurge’s Current Location in its list of shops.
*They pay a number of Macca equal to the item’s cost and receive an item matching the chosen item definition.

Add the following to the rule Items:

Name: Ring of Protection
Effect: When taking damage from the Adventuring action, that damage is three less (to a minumum of zero). Up to ten Rings of Protection can be held at any time by any given Demiurge.
Description: A golden ring topped by a tiny shield.
Types: Buff, Hold

Name: Bragging Rights Trophy
Effect: None
Description: Many awards still exist from the old world; trophies for acting, ribbons for chess competitions, cups for sporting competitions. They have little value now, but having one is still seen as a badge of honour by some.
Type: Hold

Name: Expired blood bag
Effect: This item can be used when at least one Phalanx owned by the Demiurge has the same Current Location as that Demiurge. When used, one of those Phalanxes has its health increased by 20% (rounded down).
Description: Congealed blood, not fit for human medicine.
Types: Buff, Instant

Name: Bonsai Tree
Effect: When used as a weekly action, this tree is not destroyed and it grants 1 Soul to the Demiurge performing that action.
Description: Despite being among the most fragile trees in the old world, this one somehow survived.
Types: Buff

Name: Heart Medication
Effect: When a Demiurge with Heart Medication in their Inventory performs a Beat Action, they may choose to Use Heart Medication rather than increasing their Beat Action Count.
Description: Apparently it works on the fundamental energies of creation itself, not just human hearts.
Types: Buff, Instant

Give all Item definitions a Shop of Open-air markets.
Give all items the following costs:
Raku Gem: 16,000
Taru Gem: 16,000
Ao Gem: 20,000
Midori Gem: 12,000
Gin Gem: 8,000
Ring of Protection: 4,000
Bragging Rights Trophy: 100,000
Expired Blood Bag: 10,000
Bonsai Tree: 30,000
Heart Medication: 300,000