Two independent settings
Open Campaign > Purchasing methods. Choose Default for new merchant inventories and Default for newly published salvage pools separately: One purchase per company per round; or Priorities and automatic snake draft. Save campaign purchasing methods updates the page in place. Only the campaign GM can change these settings.
Defaults apply to newly generated merchant inventories and newly published salvage pools. Existing merchant inventories may change method under Configure purchasing method before any priority list is saved. Existing purchases, units, SP debits and receipts are retained; only remaining stock is drafted. Previously recorded inventory passes remain opt-outs. Published salvage pools keep their saved method. Salvage selection shows the saved pool method (or the method to be saved at publication) and, for GMs, the campaign default with a link to edit it. Inventory configuration shows its saved campaign default and edits only that inventory.
One-per-company rounds allow any eligible company to choose its first item. It cannot choose again until other active companies choose one or pass for this inventory or pool. Snake drafts use ranked choices, Not interested, saved 2d6/tie-break ordering and alternating forward/reverse rounds. Waiting pages check turn availability with Ajax while visible and while no form is being edited.
Merchant purchases post SP and equipment immediately, or atomically when the priority draft resolves. Salvage selections reserve units and costs for GM track finalization, where mission pay and salvage awards are posted before purchase charges. A pass does not carry into the next inventory or pool.