What Is A "Dutch Auction"?

It's basic math but I still fail to get it. here's ebays explanation on it

http://pages.ebay.com/help/buy/buyer-multiple.html

Be aware that ebay's definition of "dutch auction" is somewhat different to the long-standing definition used in the "real world". Out there, a "durch auction" is just like a "normal auction", only it works backwards.

A normal auction starts off at a very low price, and the bids from the floor get higher and higher until eventually there's only one bidder left. The item is then sold at that price.

A dutch auction starts off at a very high price, and the auctioneer calls out bids that get lower and lower until eventually someone puts their hand up, and the item is sold at that price.

I assume the origin of the term derives from the old English-Dutch ethnic rivalry: in England, everything "dutch" was mixed up, back-to-front or otherwise wrong. This use of "dutch" can still be seen in the phrase "double dutch", meaning "completely incomprehensible".