Because cause and effect relationships in economics or in any other subject can be better explained with help of graphs. It also tells us what is the effect of one variable on other and how it responds to change in that variable. So instead of using words, graphs offer an easy and better way of showing relationships between two variables.
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Scientists use graphs to organize data.
bar graphs use categorical data
Architects and if you study Geometry you will have to use graphs.
Bar graphs, pie charts, and even line graphs can all be used to compare. I personally like to use Bar graphs when showing numbers.
Graphs show data in a short manner. Graphs can be found int he newspaper everyday in the financial section of the paper.