Amazon spokeswoman Patty Smith said the price differences on certain DVDs are the result of tests that the company performs to re-evaluate various aspects of its Web site, such as the navigation system, what the home page looks like, overall site design and product pricing.

CNN: Testing reveals varied DVD prices on Amazon

In this setting, moreover, finance takes on a surprisingly artistic quality whether it be the colourful ornateness of 19th-century railway bonds or design classics such as the Quotron trading terminal or much older Brunsviga-Midget System Trinks counting machine.

ECONOMIST: An enjoyable but incomplete look at Mammon's ups and downs