INTERNETRISING,PRICESFALLING 3 Figure1: E-commerceShareofRetailSales 8% 6% 4% 2% 1999 2001 2002 2004 2005 2007 2008 2010 2011 2013 2014 2016 2017 Source: U.S.CensusBureau(2018). Table1: ComparingtheDPItotheCPIandBPP DPI CPI BPP Quantities Yes No No #ofitems 2.1 M 140K 500K Offlineprices No Yes No Longhistory No Yes No All categories No Yes No MerchantIdentities No No Yes Notes: DPI = Digital Price Index (Adobe), CPI = Consumer Price Index from the BLS, and BPP = Billion Prices Project scrapeddatafromCavalloandRigobon(2016).