Final answer:
Fernand Braudel's concept that cultural change occurs at varying speeds is true, corresponding with how the market revolution brought significant changes to the United States, and cultural change happens through complex interactions among cultures.
Step-by-step explanation:
Historian Fernand Braudel did argue that cultural change occurs at varying speeds, which can be seen as true. He is well-known for his work on the longue durée, a perspective that looks at history over long periods of time, acknowledging that different aspects of society change at different rates. For instance, the market revolution in the United States brought significant social and economic changes, including shifts in labor organization, the expansion of markets, and changes in transportation and communication. Cultural change as described by anthropologists like Franz Boas also occurs through complex interactions, where cultures evolve and influence each other rather than following a unilinear trajectory towards 'civilization', often in response to factors like trade, migration, and conquest.