DEFINITION of 'Purchasing Power Parity-PPP'. An economic theory that estimates the amount of adjustment needed on the exchange rate between countries in order for the exchange to be equivalent to each currency's purchasing power.
Thomas Edison's most famous invention, the lightbulb, paved the way for modern life.
Did you think Thomas Edison was a great inventor? He wasn't.Our Guest Bloggers, Peter P. Roosen and Tatsuya Nakagawa, are the co-founders of Atomica Creative.