These associations are properly made subject to supervision and examination by state officials, in the manner of that exercised over banks. They have been favored by exempting the shares of members and the mortgages held by the associations from all state and municipal taxation. As the houses built or paid for are taxed, this is of course but just, but it is an exception to the rule of the illogical general property tax.[14] § 14. #Possible developments of savings institutions.# The social importance of increasing and improving the agencies of savings for the masses is being more fully recognized, but much more might be done in these directions. Some possible changes have been suggested above, and a few words more may be added. Probably the greatest developments in the near future will be through the savings departments of commercial banks (favored by the reserve rules of the Federal Reserve Act) rather than by the increase in the number of special banks for savings. The initial expense and risk of starting a savings bank is considerable, and outside of cities of some size this is prohibitive. Whereas a savings department, with its funds and reserves separated, can be easily and cheaply operated in connection with a general bank. It is much to be desired, however, that a larger measure of popular coöperation might be made possible to the depositors, both for its educational value and to reduce the real evil of the autocratic or the plutocratic centralization of the money power in the small communities. Savings banks usually limit the amount of an account to $3000. It is desirable that depositors should be able easily to convert their savings-bank deposits over certain amounts into good bonds, bearing a higher rate of interest (after the method of the issue of postal savings bonds). There is need of a central market in each community where such bonds can be bought and sold at any time; and the savings banks might easily serve to buy and sell for their customers in this way in the larger bond market. This would be of benefit also to the states and municipalities which issue bonds for such purposes as schools, roads, and public utilities, by creating a more open and regular market to small investors than now is provided for such securities. This might somewhat reduce the rate of interest and there would be a gain divided between taxpayers and lenders. The general plan and principles of local building and loan associations might well be extended to groups of rural coöperators, enabling them to make loans to their members; and to groups of small investors, permitting them to hold real estate mortgages and bonds and stocks of corporations, free from taxation other than that paid on the wealth itself. Members of such organizations could get a higher income on their investments than a savings bank could pay, and with greater security than if each attempted to save and invest by himself.[15]