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See the picture below. VanCamp's Pork
and Beans are on sale (price is lower). Notice that there is
a can of Campbell's Pork and Beans on the sale
display.
What is that Campbell's Pork and
Beans can doing on the display for VanCamp's Pork and
Beans?
After studying this lesson you will
be able to draw a graph illustrating what happened to the
demand for Campbell's Pork and Beans when a customer took a
can out of their shopping cart and placed it on this display
of VanCamp's beans that were on sale.
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