I am not sure that any investment in education is an investment in idle resources. It would have to be seen as a long term dedication. In the end, I cannot help but feel that a nation's competitiveness is dependent on its educational system. I don't think I am saying this as a teacher (bias completely granted), but as a global citizen. The new globalist paradigm makes competition worldwide. No longer are nations able to say, "That's a poor nation, so that's not our worry." With the advent and proliferation of technology, the world has become "flat," and with it competition for scant resources and positions take on an entirely new meaning. Education becomes critical in this because it will help further differentiate a nation's competitiveness. Investment in it reaps long term benefits so that future generations can continue on the work of the specific nation. I am not sure any investment could be considered idle, but an investment in education will reap benefits. Depending on the tye of investment, it might be both short and long term beneficial. Yet, idle would not be a term I would use to describe it. Whatever is invested will be reaped by children and social orders down the line.
I do not see any reason for considering investment in education system as investment in idle resources. An investment will be considered investment in idle resources when it creates capital resources which are not used at all. Please note that rarely a capital resource is utilized to 100 percent capacity, or kept busy 100 percent of the time. There any capital asset that is utilized fairly well but still below 100 percent is not an idle assets.
Thus an investment in education system can be considered idle only when the facilities for education created by it, or the education imparted to people using such system, are not utilized at all. This is most certainly the case. A small percentage of unemployment of educated people is due to the practical limitations of utilizing any resource to 100 percent capacity. It cannot be considered as a case of non-utilization of this resource.