Image source: Flickr user Ken Funakoshi. A perpetual annuity, also called a perpetuity, promises to pay a certain amount of money to its owner forever. A classic example would be that of a perpetual ...

An even cash flow of regularly scheduled payments defines an annuity. If you borrow money to start your business, the monthly payments are calculated using an annuity formula. Two basic annuity ...

In 1648, a Dutch government authority issued a bond that promised to pay interest forever. Written on goatskin, five such bonds are known to exist today. Yale University owns one, andin 2015, ...