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	€2,992.27	100.0%	—	3.47	201
2	Χαλκιαδάκης	€3,080.87	103.0%	+€88.60	3.57	266
3	My Market	€3,146.53	105.2%	+€154.26	3.65	121
4	Γαλαξίας	€3,218.04	107.5%	+€225.77	3.73	135
5	ΑΒ Βασιλόπουλος	€3,232.62	108.0%	+€240.35	3.75	36
6	Μασούτης	€3,266.99	109.2%	+€274.72	3.79	37
7	Synka	€3,267.32	109.2%	+€275.05	3.79	43
8	Κρητικός priciest	€3,298.69	110.2%	+€306.42	3.83	24

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 862 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.