ENDLESS argument and controversy, and no small amount of acrimony, have been engendered on both sides of the Atlantic by the complicated question of Allied war debts to the United States. All the more reason, therefore, why listeners who wish to be well informed about world problems should welcome this talk (the first of a series on ' Finance in the Modern World '). in which the thorniest of all financial problems will be authoritatively discussed by one of the most brilliant living economists, the author of ' The Economic Consequences of the Peace.'