Flows connect places; dependence on those flows means that a change in one place can affect others.
Trade connects a producer to suppliers and customers. Capital connects an investment location to owners and lenders. Labour migration connects jobs in one place with workers, households and skills in another. Several flows often support the same activity.
Interconnectedness means these links exist. Interdependence means activities rely on them: an assembly plant needs imported components, a supplier needs orders, and a household may depend on a worker's wages or remittances. The dependence is often unequal. A small supplier may rely heavily on one buyer while that buyer has many alternatives.
A disruption can therefore spread. A port closure delays parts, factories reduce production, suppliers lose orders and workers lose hours. A fall in consumer demand can travel in the opposite direction through cancelled orders. These are possible pathways; inventories, alternative routes and the duration of disruption affect the scale.
Connections also spread benefits. New demand may support production and incomes in several places. Diversifying suppliers, routes, markets and skills can reduce vulnerability, but usually adds cost or takes time. No economy becomes resilient simply by having many connections if they all depend on the same bottleneck.
Step by step
Map the link
Identify what moves and the places involved.
Identify dependence
Explain which activity cannot continue easily without that flow.
Trace the consequence
Follow the effect and identify alternatives that could weaken it.
Worked example: A missing component
An invented appliance network uses a specialised switch from one supplier. A short interruption stops final assembly despite ample supplies of every other part. The small component matters because it is essential and difficult to substitute, not because it has the highest purchase price.
Watch out for this
The place with the smallest trade value cannot be important to the network.
A small but essential input can create a bottleneck. Value and substitutability are different measures of importance.
Check your understanding
A supplier depends on one buyer, but the buyer has many substitute suppliers. What does this show?
- The supplier is likely to be more vulnerable to the relationship ending.
- Both firms must have identical bargaining power.
- No interdependence exists because the relationship is unequal.