According to Henrich's mathematical model,why would complex cultural knowledge deteriorate,as was the case in 18th-century Tasmania?

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Henrich's mathematical model suggests that cultural knowledge deteriorates when there is a shrinkage in population, as there are fewer skilled models for people to copy. This was the case in 18th-century Tasmania, where the indigenous population was decimated by disease and violence brought by European settlers. As a result, complex cultural knowledge deteriorated as there were fewer people to carry on and transmit the practices and traditions of their ancestors.

According to Henrich's Mathematical Model,why Would Complex Cultural Knowledge Deteriorate,as