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During the Great Depression, formerly wealthy executives stood in line for hours waiting in ragged clothes for a hand-out of hot soup, while the rural "poor" went about life as usual, barely noticing the Depression. Survivors of the Depression who lived in agrarian regions often joked that they were "too poor to notice the stock market crash", but they were, in fact, better off than the majority of inner-city workers in that they never went hungry. As a result of this, the one-half of Americans with access to their own home-grown foods were exempt from the horrors of the Great Depression.
Now imagine that, instead of 50% of the population suffering from the woes of an economic collapse, it was the 99.2% who are not involved in agriculture full-time. The comparison makes 1929 look like a walk in the park. Worse still, our food transporation services are now fully dependent on massive amounts of petroleum for transport, and the distances of food transporation have increased from tens of miles to thousands, which makes the modern grocery network look even more fragile by comparison.