Markets are established in the city where peasants can bring their surplus supplies and the products of the soil.
In 1900 the value of the factory products was $4,691,779; in 1905 it was $5,900,129, the city ranking third among the cities of the state in value of factory products.
But it still retained its importance as a trading and agricultural centre, even in the Roman period, exporting not only agricultural products but textile fabrics and sulphur.
The city has lumber and fishing interests (perch, whitefish, sturgeon, pickerel, bass, &c. being caught in Saginaw Bay), large machine shops and foundries (value of products in 1905, $ 1, 743, 1 55, or 31% of the total of the city's factory products), and various manufactures, including ships (wooden and steel), wooden ware, woodpipe, veneer, railroad machinery, cement, alkali and chicory.
In Roman times Sardinia, relatively somewhat more prosperous than at present, though not perhaps greatly different as regards its products, was especially noted as a grain-producing country.