Shipping Economics As The Binding Constraint (Not Just Insurance)

Issue 64 Edition 2026-03-05 7 min read

General

Sources: 1 • Confidence: Medium • Updated: 2026-03-15 09:31

Key takeaways

Insurance is described as not being the primary reason ships are avoiding Hormuz, despite widespread claims that lack of insurance is what shuts traffic down.
Crude oil is described as not being fully fungible because different geologies produce oils with different qualities that affect refining outcomes.
Greek owners are described as controlling roughly 40% of the global tanker fleet and as potentially functioning as swing providers of freight, making their willingness to transit Hormuz pivotal.
Iran is described as being able to create ship whitelists using AIS tracking and as likely being more capable than the Houthis at discriminating among targets while still causing chaos.
Oil prices are described as unusually low relative to the implied supply shock, suggesting markets are overly sanguine that disruptions will resolve quickly.

Insurance is described as not being the primary reason ships are avoiding Hormuz, despite widespread claims that lack of insurance is what shuts traffic down.
The binding constraint on Hormuz transits is described as owner risk appetite because spot tanker rates are at roughly 18-year highs, making owners unwilling to risk assets without very large premia.
War-risk insurance is described as becoming hard to price in extreme scenarios because insurers must renegotiate to find a clearing price for unusually high risk.
Replacing a lost tanker is described as being slow because shipyards are full, so even an insured loss can impose years of opportunity cost during a bull market.
Some transit attempts are described as potentially proceeding because captains can refuse danger and contracts can pay demurrage for waiting, but these arrangements are described as unlikely to restore enough volume quickly.

Crude oil is described as not being fully fungible because different geologies produce oils with different qualities that affect refining outcomes.
Replacing disrupted crude supply is described as requiring access to a mix of crude qualities rather than replacing volumes one-for-one.
Middle East crude supply is described as predominantly medium-sour barrels that are especially useful for refiners because they yield higher-value products.
Canadian crude is described as expected to help compensate for crude-quality gaps created by shifts away from certain suppliers.

Greek owners are described as controlling roughly 40% of the global tanker fleet and as potentially functioning as swing providers of freight, making their willingness to transit Hormuz pivotal.
Iran is described as operating the world’s seventh-largest VLCC fleet, and losses or removal of Iranian-controlled tankers would materially affect global energy shipping capacity.
Replacing a lost tanker is described as being slow because shipyards are full, so even an insured loss can impose years of opportunity cost during a bull market.

Iran is described as being able to create ship whitelists using AIS tracking and as likely being more capable than the Houthis at discriminating among targets while still causing chaos.
Restoring confidence is described as likely requiring initial ships to transit and reveal Iran’s response because there is no shortcut short of major escalation that would guarantee normalization.
Hormuz is described as likely to resemble a larger and more technically sophisticated version of the Red Sea disruption, with some traffic continuing but at higher risk and cost.

Oil prices are described as unusually low relative to the implied supply shock, suggesting markets are overly sanguine that disruptions will resolve quickly.
Since COVID, markets have become conditioned to fade geopolitical-risk price spikes more quickly, accelerating reaction functions in both news and pricing.

What is the verified, current percentage reduction in Hormuz transits and associated seaborne oil/LPG flows versus pre-disruption baselines?
How persistent is AIS shutdown and GPS spoofing in and around Hormuz, and does it correlate with lower completed voyages or higher incident rates?
What are the observed war-risk insurance quotes, exclusions, and turnaround times for Hormuz voyages during the disruption period?
What specific premia (freight, war-risk, demurrage) are clearing to induce owners to accept Hormuz exposure, and which owner groups are participating or abstaining?
Are there confirmed patterns of selective targeting or de facto ‘whitelisting’ by Iran (by flag, ownership, cargo, or destination)?

If owner risk appetite and fleet scarcity are the binding constraints, disruption may express first as higher freight, war premia, and effective capacity withdrawal even without immediate production cuts.
Non fungibility of Middle East medium sour may cause grade and product dislocations despite aggregate supply, implying refinery margin dispersion tied to crude quality availability rather than headline barrels.
Concentrated tanker control by Greek owners and Iranian linked VLCCs could create regime shifts in participation, where selective transits or abstention drive uneven flow normalization and persistent elevated shipping costs.

Verified decline in Hormuz transits and seaborne crude and LPG flows versus pre disruption baselines, alongside higher cleared freight, war risk, and demurrage needed to induce participation.
Persistent AIS shutdown and GPS spoofing in and around Hormuz correlated with fewer completed voyages, longer voyage times, or higher incident rates, indicating operational risk beyond insurance pricing.
Observed patterns consistent with selective targeting or de facto whitelisting by Iran such as flows concentrated by flag, ownership, cargo type, or destination, with others abstaining despite available insurance.

Verified transits and seaborne flows return near baseline while freight, war risk, and demurrage premia normalize quickly, implying economics and owner participation are not binding constraints.
War risk insurance quotes and exclusions stabilize with fast turnaround and broad coverage, and owners widely accept Hormuz exposure without requiring elevated premia.
No discernible selective targeting or whitelisting patterns and limited AIS and GPS interference, with disruption behavior resembling normal operating conditions.