Instead investors will purchase different types of capital that have the potential for profits in other industries. In this way, over time, as the current capital stock depreciates new investment is made in the types of capital needed for production in the future. With enough time, the capital stock is moved out of declining, unprofitable industries and into expanding, profitable industries. In summary, virtually all factors are immobile across industries in the very short run. As time progresses, and at some cost of adjustment, factors become mobile across sectors of the economy.
Some factors move more readily and at less cost than others.
In the long run all factors are mobile at some cost. For workers, complete mobility may require the passing of a generation out of the workforce. For capital, complete mobility requires depreciation of the unproductive capital stock, followed by new investment in profitable capital.