An old friend of mine, Emmett once told me of his policy of picking tuna when choosing a lunchtime sandwich at Tesco. His rationale is that sooner or later tuna fish will become so rare that prices of it will rise so high as to make it prohibitively expensive for the general population to afford it more than a few times a year. I told him I didn’t really like tuna that much and he agreed but said “I just…

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