Users pay a small amount for each transaction.

VOA: special.2009.11.02

"A transaction is all it was. I'll collect my hundred dollar bounty on them and be on my way."

VOA: standard.2010.06.20

"Oliver Williamson's research has offered new insights on how transaction costs determine the boundaries of the firm.

VOA: standard.2009.10.12

The ban applies to a type of transaction known as "naked short-selling."

VOA: standard.2010.05.19