PosoKanei — Cheapest Supermarket Basket

Basket cost index — cheapest = 100%

Each bar is that retailer's total for the identical basket, relative to the cheapest. 110% means you'd pay 10% more there.

#	Retailer	Basket total	Index	Extra vs cheapest	Avg / item	Items cheapest
1	Σκλαβενίτης cheapest	€2,097.67	100.0%	—	3.63	141
2	Χαλκιαδάκης	€2,166.12	103.3%	+€68.45	3.75	163
3	My Market	€2,231.04	106.4%	+€133.37	3.86	90
4	Γαλαξίας	€2,274.04	108.4%	+€176.37	3.93	83
5	Μασούτης	€2,289.79	109.2%	+€192.12	3.96	32
6	Synka	€2,290.97	109.2%	+€193.30	3.96	29
7	Κρητικός	€2,309.06	110.1%	+€211.39	3.99	20
8	ΑΒ Βασιλόπουλος priciest	€2,309.29	110.1%	+€211.62	4.00	18

Number of basket items on which each retailer has the (equal-)lowest price.

Compared retailers (basket = products carried by all of them):

My Market Synka ΑΒ Βασιλόπουλος Γαλαξίας Κρητικός Μασούτης Σκλαβενίτης Χαλκιαδάκης

Basket = the 578 products every one of these chains stocks.
Prices are the raw shelf price (current discounts included); the same product id is bought at each retailer, so totals are strictly like-for-like.
This is an unweighted basket — every product counts once, regardless of how often a household actually buys it. Loyalty-card prices are not modelled.
Adding more (smaller-catalogue) chains shrinks the common basket; this run used the 8 selected.