Could you tell me more about Inverse and reverse relation?
Actually, I think inverse and reverse mean the same thing. They're both the opposite of a DIRECT relationship. But instead of calling it an INDIRECT relationship or a REVERSE relationship, we call it an INVERSE relationship.
Actually, I think there are three basic types of relationships that can be plotted on graphs.
1) Direct relationship - When one factor increases, the other increases, too. For example, as it gets hotter, it also gets drier.
2) Inverse relationship - When one factor increases, the other decreases. For example, as the number of available workers increase, salaries decrease.
3) No relationship, indirect relationship, unpredictable relationship, etc. - As rain increases, farm products should increase, but flooding could also cause them to decrease. So you might get a graph with a line that goes up and down, rather than a straight line that goes up or down.
The third example could be kind of confusing. I just wanted to make the point that not every relationship can be classified as DIRECT or INVERSE. There are all sorts of relationships.