I think you mean cooked whole potatoes.
Potato chips are generally very low weight, and include other calorie containing products, such as oil.
Potato chips are generally very low weight, and include other calorie containing products, such as oil.
But you cannot eat that, so potato chips are a distant second (at least from the products I checked)
And no, the calories in chips added by the oil offset the lesser amount of weight you buy per unit - at least in my locality.
If I just look at calories per dollar, potato chips seem the most cost effective - at least as long as you take the cheapest ones
Pure potatoes are somewhere around 200-500 calories per dollar, cheap potato chips are around 1000/dollar
Pure noodles or rice might be even better, I didn't check those admittedly.