Potential entrants are more likely to be deterred from actually entering an industry when

incumbent firms are willing and able to be aggressive in defending their market positions against entry.

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explanation:

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the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.