Taiwan blockade scenario (economic dimension)

The Taiwan blockade scenario, economic dimension, examines the economic mechanisms and consequences of a hypothetical attempt by the People's Republic of China to restrict movement to and from Taiwan. It is scenario analysis, not a claim that a blockade is underway or inevitable. A blockade, quarantine, customs action and military exercise have different legal and operational meanings and should not be treated as synonyms.

Scenario structure

Possible scenarios range from selective inspection or exclusion measures enforced by coastguard and customs bodies to a military blockade backed by force. The economic mechanism is denial of maritime or air access. Taiwan depends on external trade and imported energy, while its ports, communications and financial system connect it to global production networks. Disruption could affect fuel, food, industrial inputs, insurance, shipping schedules and payments before inventories were exhausted.

The response would also have economic content. Taiwan and partners could use rerouting, convoy, stock release, emergency finance and export prioritisation. Other states could impose sanctions, export controls or investment restrictions on China. Those countermeasures would carry major spillovers because China, Taiwan and neighbouring economies are deeply integrated into global trade.

Evidence and modelling

The CSIS ran 26 iterations of a blockade wargame published in 2025. Its results varied with assumptions about warning, escalation, outside intervention, logistics and the ability to resupply Taiwan. The report is evidence about modelled pathways, not a forecast.

Official Taiwanese customs data establish the scale and composition of trade that a crisis could interrupt. United States Congressional Research Service material describes Taiwan's economy and external relationships. Neither dataset supplies a single credible global-loss figure. Published estimates that convert a scenario into trillions of dollars depend on choices about duration, military escalation, semiconductor substitution, financial contagion and policy response.

Statecraft significance

Economic pressure could be central even without attacks on productive assets. Control over shipping, insurance and access could seek political compliance while preserving an option to escalate. Yet coercion may fail if it strengthens resistance, attracts external support or cannot be enforced without wider war.

Analysis should specify the actor, legal claim, geographic perimeter, goods covered, enforcement method and assumed duration. It should then test inventories, alternative routes, market reactions and countermeasures. The key distinction is between an exercise that signals capability, a quarantine that asserts regulatory control and a blockade that uses force to deny access.

Limits

Open-source models cannot fully observe military plans, private inventories or crisis decisions. They can expose dependencies and planning requirements, but should not be used to claim a known timetable, outcome or cost.

The scenario is useful for stress testing only when assumptions remain visible. Analysts should vary warning time, legal characterisation, insurance response, port access, energy stocks, cyber disruption, allied intervention and duration. A quarantine enforced through inspections, a distant blockade and attacks on shipping create different legal, military and market pathways. Collapsing them into one headline estimate conceals the decisions that matter for resilience and deterrence.

See also

blockade as economic warfare · maritime interdiction · semiconductor chokepoints · Supply-chain resilience · Economic deterrence

Sources

1. Mark F. Cancian, Matthew Cancian and Eric Heginbotham, *Lights Out? Wargaming a Chinese Blockade of Taiwan* (Center for Strategic and International Studies, 2025).
2. Taiwan Customs Administration, value of imports and exports.
3. United States Congressional Research Service, *Taiwan: Political and Security Issues*, updated 10 April 2025.
4. Center for Strategic and International Studies, *How China Could Quarantine Taiwan* (2024).