The company hopes that two other things will act as barriers to entry: the size of its library and the efficiency of its distribution system.

ECONOMIST: Three-dimensional imaging

Experience in Europe and Asia shows that public authorities can increase the efficiency of goods distribution in cities by getting private firms to share their lorries.

ECONOMIST: Productivity in Latin America

Its old one is outclassed by the cool efficiency of Lianhua's distribution centre in north-west Shanghai.

ECONOMIST: Retailing in China

Due to this program, the solar energy market in Japan has expanded considerably in terms of availability and efficiency in distribution.

FORBES: Suntech To $12 On Higher Photovoltaic Module Sales

"Our current system can create some serious work disincentives, particularly at low and high ends of the income distribution, so the potential efficiency gains are pretty clear, " Justin Ross, Professor of Public Finance at Indiana University, told the BBC.

BBC: Republicans 2012: Rick Perry unveils flat tax plan

Greenpeace asks companies to measure and reduce their greenhouse gas emissions throughout the life cycle of their products: supply chain, manufacturing, distribution, customer use, and end-of-life, using a combination of energy efficiency, renewable energy, and energy policy advocacy.

FORBES: How Green Are Your Gadgets?