Passage Summary: When things change slowly, kids listen to their grandparents; when things change fast, they don't. Therefore, you can tell how fast a society is changing just by looking at how much the kids listen.

Conclusion: The speed of societal change can be determined by observing how much respect younger people show to their elders.

Reasoning: In slow-changing societies, youth value elder advice, but in fast-changing ones, they find it irrelevant and ignore it.

Analysis: The argument assumes a direct link between 'valuing advice' and 'showing deference.' While these concepts are related, they are not identical; one could respect an elder's status without actually valuing their specific advice on modern life. To make this argument work, the author needs to assume that the amount of deference shown is a reliable indicator of how much the advice is actually valued. Look for an answer that bridges this gap between the internal feeling of value and the external display of deference.