Each product in Capitalism 2 has a necessity index and a luxury index.
I understand what the necessity index does: necessity of 10 (i.e. 100%) means no change in demand during recessions, high necessity means low decrease in demand during recessions, and low necessity means high decrease in demand during recessions. However, I don't know what the luxury index does. How does the luxury index affect demand?
For reference, below is a screenshot of Capitalism 2's product database where the luxury index for each product appears in the column named "LUXURY":
The full table is also available: http://www.adammil.net/files/112/ITEM.html