This can happen if the new economic powers are more important as competitors than they are as customers.

The economically useful way to model a person is to treat him as a purposeful, goal seeking agent with pleasures and pains, desires and intentions, guilt, blame worthiness.

So we've been working with Transport for London, and that organization hasn't actually been responsible as a client for a new bus for 50 years.

This format therefore shows how dependent each sector is on every other sector, both as a customer of outputs from other sectors and as a supplier of inputs.

The US government is a huge customer for all kinds of software companies, just as it helped to build the airline industry long ago by contracting out postal service transportation.

Putin, in particular, is at home in the German language, having spent many years in East Germany during his days as a KGB agent.

Architect Kate Orff sees the oyster as an agent of urban change. Bundled into beds and sunk into city rivers, oysters slurp up pollution and make legendarily dirty waters clean thus driving even more innovation in oyster tecture. Orff shares her vision for an urban landscape that links nature and humanity for mutual benefit.