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How about the cost of the food? Tuna is expensive, condensed milk is cheap. That matters relative to the cost of the can because it's more important to make the condensed milk can cheap to store a cheap ingredient, than to worry about the minor cost of aluminium compared to expensive ingredients like tuna.



Tuna £0.67/kg [1] Condensed Milk £2.67/kg [2]

Not that it negates your point. Just struck me as interesting that tinned tuna would be seen as expensive in some places in the world. I guess it depends on the quality of the tuna[3].

[1] http://www.tesco.com/groceries/product/details/?id=256557156 [2] http://www.tesco.com/groceries/product/details /?id=265540922 [3] http://www.independent.co.uk/news/uk/home-news/tesco-accused...


That's £0.67 per 100 gr., so it's actually £6.7/kg -- 2.5 times of condensed milk.




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