Anything in the graph — a country, a company, a strait, a commodity, a currency, a power station.
The labels change with what you picked. A currency does not get destroyed; it collapses.
Every degree the graph can carry. Six is the engine's ceiling.
How the shock is allowed to travel. Switching one off removes those paths from the walk, not just from the list.
What a link has to rest on. Measured alone is the strictest reading: published bilateral trade only.
Off is the no-reroute worst case. Every number gets larger by construction, so it is labelled in the result.
Narrows the list, never the walk — a country you hide is still a country the shock travels through.