Yesterday, I slipped a crisp dollar bill into a vending machine, and down the chute came a 12-oz can of cola and a quarter and a dime change. The night before last, I ate a yummy shrimp and fruit plate aboard my airline flight. At lunch that day, my hosts provided an array of cut lettuce, unit-portion-packaged salad dressing in three flavors, a large bowl of rice and something, and several cans of carbonated beverage. At my hotel that morning, a “chef ” had prepared an omelet to my order while I…