Wanting more tomorrow than you have today. Everyone has this to some degree or another. The means by which you deal with that greed can be good or bad. Labor can't be exploited in capitalism. You have the freedom to work or not work wherever you want for whatever amount you freely agree to. Labor IS exploited in communism and socialism. Us capitalists have greatly benefited (in terms of our purchasing power relative to theirs) from external exploitation of labor in THESE systems. To our detriment of hollowing our industrial base. By extension, exporting our labor to unjust systems has been the cause of global wealth disparity.