Suppose air freight has dectupled every decade, starting at one metric ton in 1909. Then we get 10^10 metric tons in 2009 and 10^11 in 2019. That’s 4½ orders of magnitude more than my other answer. :/
I currently suspect this one is too high and that one is too low, but that one is closer.
Another attempt at q2:
Suppose air freight has dectupled every decade, starting at one metric ton in 1909. Then we get 10^10 metric tons in 2009 and 10^11 in 2019. That’s 4½ orders of magnitude more than my other answer. :/
I currently suspect this one is too high and that one is too low, but that one is closer.