When someone makes a comment that “money talks”, the idiom is usually referring to a situation where the use of financial resources helps to pave the way for a desired action or ending to occur. At its heart, the use of this saying indicates that when other methods fail, offering cash to someone who is in a position to accomplish this desired end will ensure the proper outcome. While the exact verbiage may vary somewhat, there are a number of idioms that convey the same sentiment.
One of the reasons that “money talks" is such a widely used phrase or idiom is that it perfectly describes the situation of tapping into the greed of another person in order to satisfy a personal want or need. This phenomenon is found in every culture and is common enough for everyone to understand what is meant when the words “money talks” are uttered.