The economics of the 20th-century is reconsidered. It is time to wrap up the century in some conclusions. The 20th-century closes with an international monetary system inferior to that with which it began, but much improved from the situation that existed only two and a half decades ago. It remains to be seen where leadership will come from and whether a restoration of the international monetary system will be compatible with the power configuration of the world economy. It would certainly make a contribution to world harmony.