Oil traders work on the floor of the New York Mercantile Exchange on May 11, 2012 in New York City.
Oil traders work on the floor of the New York Mercantile Exchange on May 11, 2012 in New York City. - 

Mid-day yesterday oil prices dropped three dollars in about a minute -- and they have kept falling ever since.

Was this a computer error -- or someone's "fat finger" on the button, as they say. Or is oil falling for a reason?

Samuel Chishook is a consultant with KCB Energy Economics in London.

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Follow Jeff Horwich at @jeffhorwich