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This article highlights the redesign of solar manufacturing so that it is cost-efficient for the company, as well as energy-efficient for the consumers. The lower-cost manufacturing is simpler by a decision to minimize some production costs by combining the design into a "single silicon wafer processing line." Clearly, it's a variable cost, and a positive change for the firm.

Street lights are an example of a public good - one person using a street light will not prevent others from using it, and it is impossible to stop other people from using a street light once one person is able to use it. Because they are public goods, they are provided by the government, but in this case it is costing the government too much to leave the street lights on all night, so they are considering shutting them off for a portion of the night to save money.