A Giffen good is a low-income, non-luxury product that defies standard economic and consumer demand theory. Demand for Giffen goods rises when the price rises and falls when the price falls.

Sometimes it's good to analyze things from a different perspective. In a Tuesday note, BTIG's Jonathan Krinsky presented the chart shown below as an aid to explain his somewhat bearish take on the ...

The quest for the elusive Giffen good has taken economists to the depths of the Irish potato famine, to the poorest parts of rural China and to the cages of lab rats at Texas A&M University.