Trade routes are the arteries of global commerce. They are categorized by the medium of transport:
Dominant for volume (80%+ of global trade by weight). Container ships, bulk carriers, tankers. Key chokepoints: Malacca, Suez, Panama, Hormuz, Gibraltar. Low cost/ton-mile, slow.
Air freight. High value/weight, perishable, urgent (electronics, pharma, flowers, express parcels). 1% volume, 35% value of world trade. Expensive, carbon-intensive.
Barges on navigable rivers (Rhine, Danube, Mississippi, Yangtze, Paraná) and canals (Erie, Panama, Suez, Grand Canal China). Low cost, high bulk, slow, seasonal/ice limits.
Internet, fiber optics, satellite links. Trade in services, data, software, IP, financial transactions. Instant, borderless (mostly), growing exponentially. The newest "route."
Cost, speed, reliability, cargo nature, infrastructure, geopolitics, sustainability goals. Modern supply chains are multimodal (e.g., ship → rail → truck).