Final answer:
The 'food wagon' concept differs from traditional fast-food restaurants by emphasizing low prices and operating in non-prime locations, deviating from common fast-food norms.
Explanation:
The 'food wagon' concept represents an exception to the norms of traditional fast food restaurants by featuring low prices and operating in non-prime locations, contrary to the general requirements of fast-food establishments. These food wagons often do not need a significant cash investment and may not use assembly-line production processes like typical fast-food chains.
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