They gave up the ability to make stone tools and fishing equipment and clothing because the population of about 4,000 people was simply not large enough to maintain the specialized skills necessary to keep the technology they had.
De mistede evnen til at lave benredskaber og fiskeudstyr og beklædning, fordi befolkningen på ca. 4.000 mennesker simpelthen ikke var stor nok til at opretholde de specialiserede færdigheder, der behøves for at bevare teknologierne, de havde.