This article argues against the mainstream view that eighteenth-century common rights were of little significance to working people. Markets in common rights and in their products provide an index of value, and when neither common rights nor derived products were bought and sold, values are imputed from the market prices of similar goods. Since women and children were the primary exploiters of common rights, their loss led to changes in women's economic position within the family and more generally to increased dependence of whole families on wages and wage earners.