Europe drank wine on a scale it is difficult to conceive of; our ancestors must have been in a perpetual fuddle.Johnson and Robinson go on to say that with the later inventions of beer and tea, wine finally had some competition. And that's all fine information about the history of wine, but today we have a word for someone who gets all their liquid in the form of wine: an alcoholic.
Were our ancestors used to a constantly elevated BAC? Sure. Did it affect their productivity? I would guess that it did. I can't see how it couldn't have. Which brings me to my point:
Did the invention of purified municipal water supplies lead to the acceleration of technology that characterizes the modern age? After millenia of inebriation, did western society have a nice greasy lunch and get to work one Monday?
Jared Diamond would say no, no, it had everything to do with Europe's grains and large mammals and so on, but I prefer my theory.