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Needs : As the term signifies, these are the basic requirements of Human being for their livelihood example: shelter,clothes,food etc...
Wants : these are a step ahead from needs, wants changes with time place and the individual (influencing factors) these are largely depending upon human itself. wants are determined on the basis of ones culture and personality. these are not critical in nature basically these are complimentary. if wants gets satisfied every time then they turn in to need.
For Example: You are hungry and food is your need , and want is i want to satisfy my hunger by having McDonald burger.
Demand : In simple terms if we are financially viable and easily we are able to satisfy our wants then those wants turns into Demand.