This document provides an introduction and overview of Arrighi's book "The Long Twentieth Century". It discusses how capitalism has undergone long periods of crisis, restructuring, and discontinuous change more so than brief periods of expansion. It analyzes four systemic cycles of capitalist accumulation over the past 600 years led by Genoa, the Dutch Republic, Great Britain, and the United States. Each cycle involves alternating phases of material expansion and financial expansion. It aims to identify patterns of recurrence and evolution in the current phase of financial expansion to understand if it may lead to a new reconstitution of the capitalist world system or represent a break with past patterns.