Title: "A unimodular demand type which is not a basis change of substitutes"
Last Edit:27/8/15
For further details, please contact:
       Timothy O'Connor, timothy.oconnor@economics.ox.ac.uk
       Elizabeth Baldwin, elizabeth.baldwin@nuffield.ox.ac.uk

This program checks whether or not there exists a basis change for a
specific 4x9 matrix whose resulting basis change will have max 1 positive 
and max 1 negative entry in each column.  It finds that no such basis change 
exists.  We provide here the file in Matlab .m format, so this result can 
be verified by others.
