Per Rostow there are three main requirements for take-off:1. The rate of productive investment should rise from approximately 5% to over 10% of national income or net national product2. The development of one or more substantial manufacturing sectors, with a high rate of growth;3. The existence or quick emergence of a political, social and institutional framework which exploits the impulses to expansion in the modern sector and the potential external economy effects of the take-off. The third requirement implies that the needed capital must be mobilized from domestic resources and steered into the economy, rather than into domestic or state consumption. Industrialization becomes a crucial phenomenon as it helps to prepare the basic structure for structural changes on a massive scale. Rostow says that this transition does not follow a set trend as there are a variety of different motivations or stimulus which began this growth process.