You might be comparing two similar grades, or two grades that can do the same job but have different efficiencies that need to be accounted for. The rules are generally too complex to code to an automatic conclusion. Other factors come into play. Auctions and exchanges are designed to be open to as wide an audience as possible because it drives liquidity. Business deals don't always work that way.
Anonymity is usually a requirement, but restriction of trading partners is also common.
These tend to constrain a market somewhat, but since many of these markets are for multiple-attribute products, a commodity approach may not be appropriate anyway. He is also a principal consultant with Computer Sciences Corporation where he specilaizes in application architecture - particularly distributed systems. Java and Java-based marks are trademarks or registered trademarks of Sun Microsystems, Inc. in the United States and other countries. SYS-CON Publications, Inc. is independent of Sun Microsystems, Inc.