To bargain at a night market?

A colleague complained about a busybody in- law.
“I notice you didn’t bargain when you bought vegetables at the night market just now! I could have gotten at least 30 cents less for them!”
“I would go for bigger and more expensive items to bargain! But certainly not in night markets where some are trying to eke a living!”
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Exactly! Would one try to bargain in a luxury goods store? Why bargain at places where vendors need the income the most?
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