How contracts shift the trade market 

July, 29, 2012

Denard Span Peter G. Aiken/US PresswireWhen young players like Denard Span are under control at a good price, teams balk at trading them.
Oh, sure, you can call the Minnesota Twins and ask about Denard Span, a good player who would help any good team. Span is hitting .288 with a .352 on-base percentage, solid numbers for a leadoff hitter.

But an underlying factor that makes it more difficult for the Twins to trade Span has nothing to do with OPS or defensive metrics: His contract is valuable.