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	€1,507.43	100.0%	—	3.95	81
2	Lidl	€1,521.02	100.9%	+€13.59	3.98	129
3	Χαλκιαδάκης	€1,598.78	106.1%	+€91.35	4.19	80
4	ΑΒ Βασιλόπουλος	€1,664.74	110.4%	+€157.31	4.36	8
5	Γαλαξίας	€1,668.66	110.7%	+€161.23	4.37	48
6	Synka	€1,686.04	111.8%	+€178.61	4.41	13
7	Μασούτης	€1,701.74	112.9%	+€194.31	4.45	12
8	Κρητικός priciest	€1,717.30	113.9%	+€209.87	4.50	11

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

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

Lidl Synka ΑΒ Βασιλόπουλος Γαλαξίας Κρητικός Μασούτης Σκλαβενίτης Χαλκιαδάκης

Basket = the 382 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.