Dharma is fulfillment of duties to oneself, family, to his employer, state, and society in general. In another words the job done systematically according to norms is called Dharma. And according to ones skills and abilities one can earn money in legitimate way and such money or possessions earned in legitimate way only will under the preview of ARTHA.
Enjoyment of Artha is called karma, i.e, our legitimate pleasures we get by virtue of our legitimate possessions. It could be possessions like cars, houses, money or sex. Flirting with somebody else's girl friend does not come under true KAMA.
APARIGRAHA is an important aspect of Niyama in yoga, non-possessiveness, non-holding through senses, non-greed, non-grasping, non-indulgence, non-acquisitiveness.
Even yoga teachers forget this important aspect of Niyama and see yoga as a way to earn money and such money earned is not ture 'Artha.' Even inaction sometimes can be considered as bad karma when one remains mute witness to atrocities and never raise his/her voice. Even the company of evil people can have negative impact on us as we are all answerable to the law of karma.