Sale
There is an inverse relationship between price and quantity demanded, so the elasticity coefficient is almost always negative.
Source
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"Sales Bags | Flickr - Photo Sharing!."
http://www.flickr.com/photos/27128437@N07/3020096760/in/photolist-5ASMxN-5BrTSw-5E7dTn-5EbzMh-5Pfi7a-5PFcqc-5PFq78-6cxSGw-6ddUxL-6oStve-6LJVUR-6RVfAw-6XRpXF-7kaW1f-7oCuDp-7oGnrU-7oGnuU-7rWenq-7xis9i-7xnfM9-8iNk5n-acsLbZ-7Jo3sW-fvaPZd-fuVxqr-fvaMyJ-fvaNKb-d7DCPA-deyp7c-bmvQBe-bzJwEh-7VHaQQ-7VHaA3-7VDVpc-bHs7wv-cbmyXo-cbmxDC-9x9gsB-9sWTnL-9yfPm2-9yfPqg-9yfPar-9yfNZD-9yfPvX-9yfP6Z-a4Qf7J-7MiynS-7YEEJt-cpF5YC-deyo47-dQgt2e
Flickr
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