* How do they afford such an expensive city?
* Where do they go when the work is done?
* Why don't they get the same rights as citizens?
* If the city needs them so badly and has such a hard time finding work, why aren't they allowing migrants a more permanent residency that isn't tied to a specific company?
* Why are companies and the government restricting migrant movement?
* Why do companies (sometimes) charge their migrant workers for the right to work?
* Why do companies (sometimes) withhold the passports of their workers?
* Why does the government punish overstaying a visa with caning?
I think there are a lot of parallels to western wealth disparity but there's still a lot of grossness to the systemic human labor trafficking that is the backbone of the country.