The History of Currency Full Size Version Share | Have A Question About This Topic? Address Thank you! Oops! Related Contents Keeping Up with the Joneses Lifestyle inflation can be the enemy of wealth building. What could happen if you invested instead of buying more stuff? A Penny Saved is Two Pennies Earned Here are some simple and inexpensive energy-saving tips that may help you save money. Doubling Your Money This calculator demonstrates the power of compound interest.