You're right that it may have, and you're right that it's hard to quantify. But it is thoroughly possible that the increased productivity heightened demand. The ability to create more or better output for the same amount of labor can make some production feasible that wasn't before.

After all, in net, increased production has allowed us to have more. We aren't making do with the same amount of stuff and spending less. We're spending more, and receiving much more. That money is going to other people's pockets.