Every solar panel needs around 20 grams of silver. Every electric vehicle needs 25 to 50 grams. Every AI data center requires electricity. OpenAI's Sam Altman is begging utilities for power. Meanwhile ...

Learn about currency substitution, its types, benefits, and potential risks, and why some countries use foreign currencies for extra stability and economic advantage.

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Robert Kelly is managing director of XTS ...