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Problem on slope of demand curve

The demand curve for DVD games is a straight line, therefore its slope: (1) Is constant, although price elasticity of demand drops/falls as output increases. (2) Price elasticity are both stable. (3) Is constant, although price elasticity of demand increases as the price drops/falls. (4) Differs to compensate for modifications in elasticity.

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Can someone help me in getting through this problem.

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