Singapore has had the distinction of having prioritized social and economic equity while achieving very high rates of growth over the past 30 years — an example par excellence that inequality is not just a matter of social justice but of economic performance.Finally, an example of a country that can walk and chew gum at the same time! Oh, wait...
I'm not really that familiar with Singapore (aside from knowing you can't chew gum there), so I won't comment on the particulars, but its worth noting that the comparison Stiglitz makes of Singapore's growth record to that of the US is a little unfair because Singapore was once - not that long ago - a much poorer country than the US. Standard growth theory predicts that low-income countries should "converge" (i.e., catch up) to higher income ones. That means that they'll have higher growth rates.
(Data: World Bank)
That said, many low income countries haven't managed to converge, so Singapore does stand out as a successful example which may provide some useful lessons.