For smaller holdings, those 9 basis points of difference get washed away almost immediately by transaction costs.

FORBES: Pimco Total Return ETF Shines a Light on Transaction Costs

Becoming a fiduciary is not prohibited but it does impose additional requirements and care to avoid conflicts of interest and self-dealing which can become the basis for a prohibited transaction.

FORBES: Another Perspective on the Shifting 401(k) Landscape: David Witz of Fiduciary Risk Assessment LLC (March 20,2008)

In the new model of advertising, corporations will pay operators for access to individual customers on a transaction basis.

FORBES: Apple Partners To Subsidize iTVs; Sharp To Produce Sets

Service providers pay for real-time TV services on a per-subscriber basis and for consumer purchases of a movie on-demand or a Pay-Per-View event via a transaction fee.

FORBES: Avail-TVN Channels Your Digital Video