Comparison of statements made at different periods frequently enable us to give maximal and minimal dates to the appearance of a cultural element or to assign the time limits to a movement of population. ↗
But then I go through long periods where I don't listen to things, usually when I'm working. In between the records and in between the writing I suck up books and music and movies and anything I can find. ↗
Monetary policy cannot do much about long-run growth, all we can try to do is to try to smooth out periods where the economy is depressed because of lack of demand. ↗
The original lists were probably carved in stone and represented longer periods of time. They contained things like 'Get More Clay. Make Better Oven.' ↗