### Comment:
In the 1400s or really any time before early 1800s how was the world *not* a zero sum? You're claiming it was? What am I missing? Actually kind of curious. Not saying you're wrong.

### REPLY:
If we say the metric was food production then this means that you can only get more production by taking it away from someone else. This can't be true because you always can just plant more crops as long as you have space. Also agriculture has constantly changed throughout history [wiki](https://en.wikipedia.org/wiki/History_of_agriculture#Europe).  


### END.