I'm under the impression that anything I cook at home, no matter how much I splurge on my favourite foods, will be cheaper than junk food.
Here is my comparison:
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'gourmet' food – salmon + asparagus (chosen because I love them, but also because both are among the most expensive stuff here).
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junk food – BigMac menu.
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0.5 kg of salmon + 0.5 kg of aspargus is about 16 euro. That's a 2-people meal. So about 8 euro / meal (Bonus – the effort to cook is minimal).
If I replace the salmon with cheaper fish or seafood, it will go as low as 5 euro.
The BigMac menu (= 1 meal) is about 7 euro (no desert).
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So ok, maybe not technically cheaper, but around the same price. I think you get my point.