I was reminded this week of the concept of trade through an incident that occurred at a coffee bar at an airport where I was staring at the menu knowing that I only had $3 in my pocket.
The rest of my hard earned cash had been exhausted on goods in my suitcase and the overweight fee you had to pay at departure. Blurry eyed and jet-lagged I tried to make the decision between a latte that would have given me some energy via a jolting caffeine boost and the tempting pastry that would stave off the hunger pains until the airline snack arrives in six hours' time.
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