Prabhat Patnaik explains how the colonial system led to depression. Then, in advanced countries governments stepped in to increase demand and productivity, but how unless the periphery is available for extraction of wealth and cheap provision of inputs the system would collapse. So, the Global South was absorbed by a globalization process where finance becomes predominant, income deflation is widespread and governments everywhere are turned into servants of financialization.
Imperialism then and now: [2] Wealth drain, depression, the role of the state and globalization
Prabhat Patnaik explains how the colonial system led to depression