Added together, the activities that run outside the law make up a significant share of the world's economy, not a fringe around it. Any account of how wealth and economic power work that leaves them out is missing a large part of the picture.
Illegal trade is one continuous chain. A child selling cigarettes on a street corner in a war zone and the networks moving goods across continents and oceans are links in the same system. The small, visible trade and the vast hidden one depend on each other.
Weapons, drugs, diamonds, oil, food, and even people move through the same routes: border crossings, ports, and money-laundering systems. These pathways work like shared infrastructure. Once a channel exists, almost any kind of cargo can flow through it.
Security measures across transport and trade are partly illusion. They look like protection while the hidden flows carry on through them. Measures built after a scare can do more to create a feeling of safety than to actually stop illicit goods.
Illegal and legal economies are not cleanly separated, and neither are criminals and authorities. Officials, businesspeople, and powerful elites profit alongside smugglers, so the usual picture of a 'criminal' as an outsider breaks down.