In Western countries , electricity , gas , and water are not luxuries but necessities . Companies now realize that consumers want products that will not only work effectively , but also save money .
For most North American households , lighting accounts for 10 percent to 15 percent of the electricity bill . However , this amount can be reduced bu replacing an ordinary 100-watt light bulb with an energy-saving blub. These bulbs use a quarter of the electricity of standard bulbs and las eight times longer . Therefore consumers can save about US$7 to US$21 per bulb .
In Europe , there is a labeling scheme for refrigerators , freezers , washing machines and tumble dryers . The label tells the consumers how much appliances in the same category
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