In any case, "money multiplier" is not "the principle of money multiplication". I'm not sure what is even meant by the term "the principle of money multiplication". Googling "the principle of money multiplication" gives me two hits. That's certainly not a phrase that's commonly used.
Googling "
the principle of money" gives me about 63,400 results, whereas "
the principle of multiplication" yields about 6,130,000 results, lol. The search for the phrase "
money multiplication" produces only about 21,000 results. Apparently, money multiplication and the principle behind it are certainly not what people discuss on a daily basis, double lol...