Primary sources document the decline in prices of cotton goods during the industrial revolution. In yams, coarse weft changed little in price between the 1780s and the end of the century, warp yams declined more, and the new fine yarns most-nearly 90 per cent. In the next decades, prices of ordinary yam declined about 4 per cent per year while fine yam declined less than half as much. The price of cloth declined much less than vam prices. The price of a standard grey calico declined about a quarter by 1800 and the decline continued for several more decades.