"Hamilton wanted his central bank to be profitable enough to attract private investors while serving the public interest. He knew the composition of its board would be an inflammatory issue. Directors would consist of a "small and select class of men." To prevent an abuse of trust, Hamilton suggested mandatory rotation. "The necessary secrecy" of directors' transactions will give "unlimited scope to imagination to infer that something is or may be wrong. And this inevitable mystery is a solid reason for inserting in the constitution of a Bank the necessity of a change of men."17 But who would direct this mysterious bastion of money? Its ten million dollars in capital would be several times larger than the combined capital of all existing banks, eclipsing anything ever seen in America. Hamilton, wanting the bank to remain predominantly in private hands, advanced a theory that became a truism of central banking--that monetary policy was so liable to abuse that it needed some insulation from interfering politicians: "To attach full confidence to an institution of this nature, it appears to be an essential ingredient in its structure that it shall be under a private not a public direction, under the guidance of individual interest, not of public policy."18"