Krugman was the lone winner of the prize, somehing that is fairly rare. The citation said that his theory on trade and globalization helped him bag the honour.
Krugman, along with Tom Friedman, has always been one of my favourite columnists. What I like about his writing is his clarity and simplicity, his style that cuts out all the clutter an economics column is susceptible to. Moreover, his honesty is unquestionable. Whenever he enters the realm of politics, he plays it with a clear face.
Whether it was his praise for Hillary Clinton's healthcare plan over Obama's (that, at a time when the American media was ready to declare Obama President of the Universe) or his criticism of the Republican Party for its absolute denial and overt and uncontrolled love for tax cuts, Krugman has discussed them all. He definitely deserves the Nobel Prize and I certainly hopes he keeps writing.