I am interested in sorting a hash in a different sort of way.... This snippet looks like it should work be me, what am i missing?

foreach  my $market (sort { $market_hash->{$a}[1] cmp $market_hash->{$
+b}[1]
 } keys (%{$market_data}) ) {
    print "$market,$market_hash->{$market}[1],$average\n";
}
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$market_hash is a reference to a hash which has values that are references to arrays. I am interested in sorting the has on the 2nd value in the array that is the value. Any ideas why this doesn't work? ben