His presidential campaign has revealed Bain still provides a lucrative annual income stream from deals he invested in, which has caused political headaches aplenty.

FORBES: The Truth About Bain: Inside The House That Mitt Built

Vodafone, a big mobile operator based in Britain, sees mobile advertising as a potentially lucrative source of additional income.

ECONOMIST: Mobile advertising

Looked at from our perspective, new headline-making penalties on income are a form of Washington "stimulus" that give lawyers and accountants a great deal of lucrative work.

FORBES: Political Economy