One of the standard lines of the people opposing Korean unification (all the way up to
AntiUnification Minister Chung Dong-young) is that a quick unification of the Koreas is prohibitively expensive and the North must be brought up to the South's level of development before unification is possible.
Well, the studies of a Korean professor for the Brookings institute (a liberal think tank based in Washington) says that not only is unification delayed unification denied, it is also unification made more expensive. Let's get straight to the meat:
According to Hwang’s estimates, the cost of unification would have been US$312 billion in 1990, US$777.6 billion in 1995 and US$1.204 trillion in 2000.
(The article does not state if those are constant dollars.)
That does not include the billions that South Korea has already thrown down the black hole of 'development aid' to the North.