Its proponents want to preserve a specific pattern of production. They do not understand the mutuality of trade. They do not realize that both parties gain from a successful voluntary transaction. Nor do they recognize the inevitability of change. Nothing in this world stands still.
People move, The wishes of consumers change.
Their knowledge is continually shifting. Changes also take place in stocks of available resources and the most economical places in which to produce particular items. Producers, investors and workers should be free to move about and adjust to these many changes as best they can. Any attempt to maintain, for political reasons, some rigid pattern of production is bound to fail. Insofar as production is guided by political, rather than economic, motives, it becomes more expensive and wasteful.