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Which of the following statements is incorrect?

[A].	An indifference curve must be downward sloping to the right	[B].	Convexity of a curve implies that the slope of the curve diminishes as one moves from left to right
[C].	The elasticity of substitution between two goods to a consumer is zero	[D].	The total effect of a change in the price of a good on its quantity demanded is called the price effect

Answer: Option C