The costs that a unified Korea will likely have to endure to have such a final outcome, however, will be high. The RAND Corporation conducted a study in 2009 that recommended that an investment of $62 billion USD be made in order to just double the North Korean GDP within 5-6 years following reunification. It also gave an estimate of $1.7 trillion USD to have overall parity that would take place decades later. The costs will be high. Yet the benefits of a unified Korean state should eventually allow such an event to occur.