In which case: all the money that's being hoarded ends up out of circulation, which means that the economy would stagnate. And how is that a good thing again? Because you learned that 'saving is good' from having a piggy bank as a kid, and that's where your understanding of economics ended?

I believe you could get a beer in the movie theater back then... maybe the intermission was for the pee break?

Tay-Sachs frequently doesn't cause death until the afflicted is in their 20s or 30s. Like most traditional cultures, Jewish culture places a lot of weight on getting married and having children. So, chances are the disease would be passed on well before it becomes lethal in any individual. So, no effect on the propagation of the genes.