That is why the next wave of environmental policymaking will need to employ commonsense tools such as cost-benefit analysis, and make greater use of flexible, market-based instruments such as emissions-trading, rather than the tired command-and-control approach favoured by most greens.

ECONOMIST: Energy and the environment

Some people use the debt to make more money than the cost of borrowing the money.

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Public educators can use 3D printers or laser cutters to make inexpensive copies out of plastic or cardboard at extremely low cost.

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