The seasonal yield of olives in a vineyard in Piraeus, Greece,is greatly influenced by a process of branch pruning. If olivetrees are pruned every two weeks, output is increased. The pruningprocess requires considerably more labour than permitting theolives to grow on their own, and it results in smaller-sizedolives. It also permits olive trees to be spaced closer together.The yield of 1 barrel of olives by pruning requires 5 hours oflabour and 1 acre of land. The production of a barrel of olives bythe normal process requires only 2 labour hours but takes 2 acresof land. An olive grower has 250
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