By the standard measure of purchasing-power parity, which reflects currencies' relative buying power, all of South-East Asia's currencies are now undervalued.

ECONOMIST: Asian currencies

McCain also said the government should use its purchasing power to promote energy efficiency, buying fuel-efficient vehicles and retrofitting federal offices to use less electricity.

NPR: Candidates' Plans to Combat High Energy Costs

This year, entrepreneurs have been new sites nearly every week that offer consumers deals at spas, ice cream parlors and corner delis each week by combining the purchasing power of a group of consumers buying a specific deal.

FORBES: E-commerce's Feeding Frenzy