When it comes to illustrating ideas, the theoretical, and the intangible– the artists in the Directory of Illustration are heartily equipped.
Economics- the dastardly interesting way money flows, is excellently conceptualized by the Directory of Illustration artists.

Peter Cook :: Trend Collapse

Min Jae Hong :: Economic Chess

Gatis Šļūka :: Falling of money angel

Barbara Kelley :: Elastic Money Crisis, The Wall Street Journal

Clear As Mud :: Financial Infographic

Oliver Scott :: Stock Search

Aad Goudappel :: Hungry for Money

Tim Bower :: Riding the Stock Market

Julien Pacaud :: Money Advice / Redbook

Mark Boardman :: Wealth

Keni Thomas :: Old Money