Several key missing components from this discussion. First, hunter-gatherers are defined primarily by land. Indeed, on the grand scale there is not much difference between farming and gathering: seasons and good/bad years still exist, but generally food sources are replenished except in cases of major events (volcano, fires, huge climate changes etc). H/G also have stronger birth control (i.e. Less children) to keep the population sufficiently low. If farming is possible (land allows for it) many h/gs opted for semi-sedentary lifestyles, taking the best from both worlds. There are numerous advantages of a farming lifestyle, like easier management and chance for food surplus (which in turn leads to specialization of certain members of the community and all other nice benefits of civilization) but also has great disadvantages - plagues, famine, social unrest and being a magnet for plunder, to name just a few.
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