How do you make money on global city?

Excuse me, could you please elaborate on how one can make money in the context of global cities? Are there specific industries or sectors that tend to be more lucrative? What skills or expertise are required to capitalize on opportunities in these environments? Additionally, are there any unique challenges or risks associated with pursuing financial gains in global cities? I'm particularly interested in hearing about strategies that leverage the interconnectedness and dynamism of these urban centers.