You own a gram of high grade hashish that's wrapped in cellophane and shoved up your ass. Its worth a lot of meals! You and your faithful cat have wandered the countryside for days finding almost nothing to eat and very little potable water. But on climbing to the top of a hill you see a deer below grazing on the spiky grass that only makes men sick. You raise your rifle and give a quick prayer to the Spider God and you shoot. The round clocks the meaty animal in the head and its down! You and your cat eat very very well that day. You have more meat then you can devour before it goes bad. So you two go to the mutant market. Two trade half the deer for seven rifle rounds, and enough water to fill your waterskin. Plus a oiling's worth of grease for Cheswick's suit. A profitable day. You and your faithful cat wander on.