Manufactured diamonds have become as big and virtually indistinguishable from the best natural diamonds (Dan Mitchell, "Fake Gems, Genuine Appeal," New York Times, June 21, 2008). Suppose consumers change from believing that manufactured diamonds, q1, were imperfect substitutes for natural diamonds, q2, to perfect substitutes, so that their utility function becomes U(q1, q2) = q1 + q2. What effect will that have on the demand for manufactured diamonds? Derive the new demand curve for manufactured diamonds and draw it.