How can we differentiate between ‘material greed’ and ‘material need’?

These two behaviours cannot be clearly differentiated, it depends on the person. As per my understanding, ‘material need’ is provisioning for those things which are required for staying alive; not for enjoyment and comfort. A man must define the list of such things himself. Additionally, he must think about all those occupations that kill his time and energy and distract him from his goal.