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Tip: Never post positive reviews for any product you buy on Amazon. The seller / Amazon algorithm will increase the price of the product in the future if you do. If the product is bad definitely post a negative review with the facts so that others are warned.

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same zomato does.. these bastards increase the food price if they see many positive ratings.. i have seen some food items price increased by 21% in 6 months

There is rampant food inflation in the US.

True. Give a restaurant positive ratings and all the listings in it will show a price hike in the future. Worse, if you rate the the individual items too, the price of the items you rated positively will be shown higher to you across Zomato. Same with searching for a restaurant or particular food item - suddenly all the prices will be jacked up in that particular restaurant or for that particular food item (this is particularly rampant in Swiggy).

Does Amazon score reviews based on user "negativity"?

I don't know, and I am not advocating posting negative reviews for every product you buy. Only the ones that genuinely do deserve negative reviews. Everytime I have posted positive reviews, and wanted to purchase the same product again, I found its price jacked up. If the review system is being used against us users, then it makes sense to stop using it and supporting it.

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