The GDP (PPP) IMF projections for South Korea and Singpore from 2010 to 2015 are for 32% growth or almost 6% per year.
In over half of the years from 2000-2010 Singapore has had over 7% GDP growth.
Singapore has a higher GDP per capita than the USA already. Singapore is a city state with about 5 million people. However, the UK is 90% urban and the USA is 77% urban.
In non-recession years South Korea has been able to maintain about 5% GDP growth South Korea has about 80% of the population of the UK.
There are some older statistics on per capita income (2000) and household income in US metropolitan statistical areas.
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