"You see, another reason for nationalization was that private ownership meant fragmentation"

This quote by Barbara Castle is describing the concept of nationalization, which is the procedure of taking a market or service that is owned by private people or companies and transferring it to the ownership of the state. Castle is suggesting that one of the factors for nationalization was that personal ownership of an industry or service might result in fragmentation. This implies that the industry or service would be divided up among various owners, which could cause a lack of coordination and performance. Nationalization would allow the state to take control of the market or service and guarantee that it is managed in a more unified and efficient way. This might cause much better outcomes for the market or service, along with for individuals who use it.