“The nature of capital was a major debate issue at the turn of the twentieth century because economist wanted to know how quickly the economy could adjust and recover from a depression. If capital were homogeneous and highly liquid, then the adjustment process should not take long and the economy could soon be back on its feet. But if capital were heterogeneous and not easily transferable to other uses, then the adjustment process could take much longer and it might take years for a nation to recover from a depression”