From the mid-nineteenth century, mutual organisations embraced these ideas in economic enterprises, firstly amongst tradespeople, and later in cooperative stores, educational institutes, financial institutions and industrial enterprises. The common thread (enacted in different ways, and subject to the constraints of various systems of national law) is the principle that an enterprise or association should be owned and controlled by the people it serves, and share any surpluses on the basis of each member's cooperative contribution (as a producer, labourer or consumer) rather than their capacity to invest financial capital.