Two different (but not totally independent) issues. The dysgenic trend in fertility is an empirical fact, as is the increasing prevalence of mutant genes.
People don't understand the problem of dysgenic fertility because it's unintuitive exponential change, like mass immigration. Suppose you start with two equally sized populations of 1 million each. Population A has a fertility rate of 1.5 and B has 2.5. After 200 years, say 7 generations, population A is down to 130 thousand and population B is up to 4.8 millions.
Two different (but not totally independent) issues. The dysgenic trend in fertility is an empirical fact, as is the increasing prevalence of mutant genes.
People don't understand the problem of dysgenic fertility because it's unintuitive exponential change, like mass immigration. Suppose you start with two equally sized populations of 1 million each. Population A has a fertility rate of 1.5 and B has 2.5. After 200 years, say 7 generations, population A is down to 130 thousand and population B is up to 4.8 millions.
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