Cash for passports: How much it costs to buy a visa

Experts advising on investor permits for Ireland, Malta and Bulgaria also reported steady interest from Russia last year.

During the same period, an influx of Chinese applicants exhausted U.S. supplies of investor visas.

The bulk of the golden visa programs are clustered in Europe, many of which were devised following the financial crisis as a way for cash-strapped governments to boost revenues. A number of countries in the Caribbean also open their borders to rich investors.

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