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Wiktionary
scramble competition

n. (context sciences English) A type of competition where the resource is inadequate to fit the needs of all, resulting in each competitor obtaining an equally partitioned amount and thus never the amount it needs.

Wikipedia
Scramble competition

In ecology, scramble competition refers to a situation in which a resource is accessible to all competitors (that is, it is not monopolizable by an individual or group). However, since the particular resource is usually finite, scramble competition may lead to decreased survival rates for all competitors if the resource is used to its carrying capacity. Scramble competition is also defined as “[a] finite resource [that] is shared equally amongst the competitors so that the quantity of food per individual declines with increasing population density”. A further description of scramble competition is “competition for a resource that is inadequate for the needs of all, but which is partitioned equally among contestants, so that no competitor obtains the amount it needs and all would die in extreme cases.”