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Concave: Clearly if function is strictly

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Clearly if function is strictly concave upward (downward) then it is concave upward (downward). Now, let's see what is the geometric meaning of the concave functions. Without loss of generality assume that a

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Cost-benefit	Rating 4.5 out of 10 5
Comfortable	Rating 4.3 out of 5
It's light	Rating 4.3 out of 5
Quality of materials	Rating 4.1 of 5
Easy to assemble	Assessment 4 of 5