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\section{Motivation}

Margarine or butter? According to the website of the
%%%National Association of Margarine Manufacturers (2005)
\cite{RefWorks:239}, ``Despite the
recommendations of health professionals and leading health
organizations to choose margarine, many consumers are confused.''
But whether or not they are confused, consumers are voting with
their pocketbooks.  The
%%%American Butter Institute (2005)
\cite{RefWorks:240}, whose
slogan is ``Things are better with butter!'', presents many tempting
recipes on its website, but also reports declining sales in its
marketing releases.

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%\bibitem[{American Butter Institute(2005)}]{abi}
%American Butter Institute. 2005. Dairy market report. Retrieved June
%14, 2005, www.butterinstitute.org.

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