Shipments of product from manufacturer to the retailer are tracked by the U.S. Census Bureau. The value of shipments for computer and electronic products in September 2009, 2010, and 2011 are shown in the table below, along with the CPI and PPI for each of these months.

a. Use the CPI to deflate the value of the shipped computer and electronics products.
b. Use the PPI to deflate the value of the shipped computer and electronics products.
c. Which index, the CPI or PPI, do you feel is more appropriate for deflating these shipment values? Why?

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2009 2010 2011 Manufacturer Shipments (S billions) $29.1 $33.3 $32.9 CPI 216.0 218.4 226.9 PPI 173.4 180.2 192.5