What's the most lucrative way to run a food cart / truck?

Small menu. Good location. Good profit margins.

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For food, move to a second world country where they don't sell the type of food you can cook. Good profit margins for food.

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As if this had to be something you'd need to focus on when it comes to restaurants or even takeaway places. Literally every completely crap diner or restaurant, any takeaway place uses ingredients that cost a fraction of what they sell it for.

The biggest ones are ...

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