THE GEOGRAPHY OF TRANSPORT SYSTEMS
| Trade | Migration | Telecommunications | |
| Nature | Flows of physical goods | Flows of people | Flows of information |
| Types | Raw materials, energy, food, parts and consumption goods | Permanent, temporary (migrant workers), tourism | Communication, power exchanges, symbolic exchanges |
| Medium | Transport modes and terminals (freight) | Transport modes and terminals (passengers) | Transport modes and terminals (postal), telecommunication systems |
| Gateways | Ports | Airports | Global cities |
| Speed | Low to average | Slow to fast | Instantaneous |
| Capacity | Very large | Large | Almost unlimited |
The three major flows behind globalization concern freight (trade), passengers (migration) and information (telecommunications).