When people use a common resource such as water, some will act in a way to maximize it their own benefit ("if i don't use it, someone else will") and the resource becomes overused or damaged. this is known as .

The graph shows the number of employed workers in the united states in nonfarm jobs from 2008 to 2013. the best conclusion that can be drawn from the graph is that the number of nonfarm jobs remained consistent over time. started going down in 2008. went up every year since 2008. started going down in 2010.