Use of an average cotton fiber price across all qualities, or a single price for one quality, with the assumption of a homogeneous product, precludes analysis of demand differentiated according to end-use fiber characteristics requirements. Quarterly mill demand for cotton fiber is estimated for three end-use categories; (1) duck, and associated fabrics, (2) corduroy, and (3) printcloth, such that quality price differentials enter into the demand parameter estimates. Responsiveness of fiber demand for each end-use to price and non-price (fiber characteristics and alternative spinning technologies) factors is discussed.