According to Sassan, which of the following is NOT considered an essential characteristic of a global city?

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They serve as hubs for global economic governance and decision-making.They attract a significant influx of tourists from around the globe.They host major financial institutions and specialized service companies.They function as marketplaces for trading financial service products.

Explanation

Global cities, as defined by Sassan, are primarily centers for economic leadership, financial services, and markets for financial products. While tourism can be prominent, it is not a required attribute of a global city.