Isabelle LEONARD Project manager for statistical issues Insee 2015/10/01 Real sale prices vs. displayed prices : an issue to consider before expanding scanner data to other sectors than food products French scanner data project

2015/10/01 European scanner data workshop 2 French scanner data project Objective : Computing an index using scanner data for industrial food products, health and beauty, and home care products sold in mass-market retail stores in métropolitan France without changing the current concepts of the CPI  Laspeyres index, chained annualy Basket up-dated at the beginning of each year Weight computed from the turnovers of the previous year Replacements of products during the year with a quality-adjustment

2015/10/01 European scanner data workshop 3 The phases of a project at Insee

2015/10/01 European scanner data workshop 4 A first test in 2011 Goal : checking of the prices provided in the scanner data Method : search for the products collected in outlets in a sample of scanner data (10 families of products sold in 1000 outlets) by teams in offices that compared the descriptions of the products in the collection and in scanner data Results : Number of products% Identical prices20860 Prices difference < 5%5115 Prices difference > 5% or failure to find the product 8625 Total345100

2015/10/01 European scanner data workshop 5 A second test in 2014 A new method to correct two problems in the first test : –Using the GTIN to identify products in the collection –Using daily scanner data prices (v.s. weekly average prices) Aims of the 2 nd test : –Is the GTIN a reliable identifier for items? –Are the prices in scanner data close to the prices in collection?

2015/10/01 European scanner data workshop 6 The management of the test When ? From the 2 nd until the 27 th of june 2014 Where? in supermarkets and hypermarkets of metropolitan France (Only the stores of the firms that agree to send their scanner data to Insee) How? The barcodes of the items were scanned by price collectors at the same time they collected the prices of all products of the CPI

2015/10/01 European scanner data workshop 7 The search for sales in scanner data 1021 barcodes scanned in 40 outlets Research for a sale from the 5th of may until the 27th of july independently of the date of the collection the sale retained is closest to the date of the collection

2015/10/01 European scanner data workshop 8 Results of the test Number of products% Identical prices82981,3 Different prices12412,1 No sale353,4 The barcodes don’t translate a GTIN333,2 TOTAL ,0

2015/10/01 European scanner data workshop 9 Products not sold during the 3 months Sectors Number of products not sold Number of products sold % of products not sold Food products15260,2 Manufactured goods122344,9 Clothing131289,2 Durables goods96512,2 Total359533,5

2015/10/01 European scanner data workshop 10 Period between the sale and the collection sectors % of products sold Number of matched barcodes Max length before the collection Max length after the collection from 8 until 49 days from 1 until 7 days the same day from 1 until 7 days from 8 until 49 days beforethanafter the collection Food products Manufactured goods Clothing Durable goods Total6,114,055,514,

2015/10/01 European scanner data workshop 11 Différent dates, more different prices? sector Products sold the same dayanother day than the collection Number of products Number of products sold at different prices % Number of products Number of products sold at different prices % Food products423429,910387,8 Manufactured goods8655, ,9 Clothing13538, ,6 Durable goods7114, ,9 Total , ,7

2015/10/01 European scanner data workshop 12 Results and limits Less sales in clothing and durables goods –Many days without sales of a precise product –For some items, no sales during a long period but no evident consequences on prices The limits of the study –Few products in durable goods and clothing (215) –July (the month after the test) is a sales period in France –No specialised store in the sample of outlet

Thank you for your attention ! Contact Isabelle Léonard Tél. : Courriel Insee 18 bd Adolphe-Pinard Paris Cedex 14 Informations statistiques : / Contacter l’Insee (coût d’un appel local) du lundi au vendredi de 9h00 à 17h00