With a price of about 60 billion euros per kilogram, what is probably the most expensive item on earth?

BRY2K

Could it be the Treskilling Yellow stamp from Sweden -- probably the only one of its kind. It has a current value of more than $2 million (or $87 billion per kilogram, according to the site). By the 1990s the stamp price crossed $1 million for the first time and was setting records every time it changed hands. The last sale was in 1996 when it sold for 2,875,000 Swiss Francs ($2.6 million US) to collectors who remain anonymous. http://www.luxist.com/2008/02/04/the-world-of-rare-stamps-treskilling-yellow-is-most-valuable/ Apr 05 08, 3:50 PM

dj168

The International Space Station, also called the Sixteen nation station, will cost about $100,000,000,000.00 USD. That's $100 billion. OR anything that's "priceless". Mastercard. xD http://thelongestlistofthelongeststuffatthelongestdomainnameatlonglast.com/expensive39.html Apr 05 08, 6:53 PM

Dim_Wittington

Could still be anti-matter (check out the cost section) http://en.wikipedia.org/wiki/Antimatter#Cost Apr 05 08, 9:55 PM