(1 + c)/(r + e + c). The money multiplier (also called the credit multiplier or the deposit multiplier) is a measure of the extent to which the creation of money in the banking system causes the growth in the money supply to exceed growth in the monetary base.
A buzzing light switch could mean the fixture is wearing out, causing an arc of electricity behind the wall plate. If this is the case, the potential for an electrical fire may exist.
A buzzing sound coming from your air conditioning system can have a number of different causes. It is possible that this is an electrical problem. It may be the contactor in your system, which feeds the start capacitor. If the contact points are dirty or burnt, you may hear a buzzing, chattering sound coming from your system.