On the subject of bubbles, there looks to be one going on in...

On the subject of bubbles, there looks to be one going on in Iowa farmland at the moment, selling at up to $14,300 an acre, causing gasps of disbelief.

One wise person made the observation:

"Any time you have an asset that doubles in value over a decade, there is cause for concern about how sustainable that growth is,” said Richard A. Brown, chief economist at the Federal Deposit Insurance Corporation.

Correct, and how much has gold gone up over the last decade?

Six times.