This is in contrast to the more permanent rents arising from firms bargaining power over work visa holders.

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If they don't work, holders of American and Western European securities may find themselves if they are worth the paper they're printed on.

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"In the case of Indonesian banks in Singapore, this will be by way of a broader provision of financial services, both in wholesale banking and to, for example, Indonesian students and work permit holders in Singapore, " the Monetary Authority of Singapore said in a statement.

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