Demand is a deficiency state felt something do.Do may be shortages of food, housing, knowledge, etc.Moi people with different needs each and it always changes depending on living conditions , health status, compared on.Tuy demand course is divided into three main types of biological, social, and the than.Cho example, people born should have food, clothes to survive is tai.Do birth hoc.Sau when demand grows to a certain age, human beings need to be yourself thiet.Do friends is demand out there hoi.Ngoai social needs who require the than.con knowledge to develop in your life and express yourself
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