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Demand curves when longer periods are considered

Whenever longer periods are considered and hence bigger ranges of adjustments (that is, substitutions) become probable, demand curves tend to become: (i) Flatter, and therefore do supply curves. (ii) Flatter, as supply curves become steeper. (iii) Steeper, and therefore do supply curves. (iv) Steeper as supply curves become flatter.

Can someone help me in getting through this problem.

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