Why does federal reserve require banks to keep a percentage of their funds as reserves

By increasing the reserve requirement, the Federal Reserve is essentially taking money out of the money supply and increasing the cost of credit. Lowering the reserve requirement pumps money into the economy by giving banks excess reserves, which promotes the expansion for bank credit and lowers rates.

Explanation:

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an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.

answer; grew into towns and cities;