I don't think it's correct to say that every time you spend money, you make the currency used weaker. You have to remember that every dollar spent or supplied is also a dollar demanded by the seller of goods.
The exchange supply of money (MSe) is the subset of the stock of money spent in a period. The exchande demand for money (MDe) is the stock of money demanded in exchange for goods in the same period. If MSe=MDe then nothing happens to the purchasing power of money (PPM). If MSe>MDe, then prices will be bid up for the different goods and PPM declines until MSe=MDe. If MSe<MDe, then prices will fall for the different goods and PPM increases until MSe=MDe.
I don't think it's correct to say that every time you spend money, you make the currency used weaker. You have to remember that every dollar spent or supplied is also a dollar demanded by the seller of goods.
The exchange supply of money (MSe) is the subset of the stock of money spent in a period. The exchande demand for money (MDe) is the stock of money demanded in exchange for goods in the same period. If MSe=MDe then nothing happens to the purchasing power of money (PPM). If MSe>MDe, then prices will be bid up for the different goods and PPM declines until MSe=MDe. If MSe<MDe, then prices will fall for the different goods and PPM increases until MSe=MDe.