Rohan says a big supermarket will always be cheaper than a small kirana shop, because it is big

Rohan says a big supermarket will always be cheaper than a small kirana shop, because it is big. His sister says being big is no guarantee of being the cheapest. Who is right?

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More disagreements in Understanding Markets

Aarav buys something from a shop for ₹50 Isha says buying vegetables straight from the farmer will always be cheaper than a shop, s There are two sweet shops in the market The city doubled the bus fare Tanya assumes the price of tomatoes is the same across the whole city today — same day, same city