Carrara Carrara Carrara () is a city and "comune" in Tuscany, in central Italy, of the province of Massa and Carrara, and notable for the white or blue-grey marble quarried there. It is on the Carrione River, some west-northwest of Florence. Its motto is "Fortitudo mea in rota" (Latin: "My strength is in the wheel"). There were known settlements in the area as early as the 9th century BC, when the Apuan Ligures lived in the region. The current town originated from the borough built to house workers in the marble quarries created by the Romans after their conquest of Liguria
Economic region of production that increases in both capital and labour are required to produce a given fixed quantity of output. The ridge lines are the combination of points where marginal product (MP) of one of the factors is zero. The theory entails that there is a limit to how much one factor can be substituted for another. When production reaches a point where substitution between the factors becomes impossible (MP), the isoquant becomes positively sloping. No rational entrepreneur will operate at a point outside the ridge lines (Region of Economic Nonsense). Economic region of production In economics, the economic region of production is