There are no videos of the protest at the commercial salt works. To portray what happened, the video uses a combination of documentary techniques. What are these techniques? What effect do they have? Support your response with evidence from the video

He have four effects of the introduction of steam-powered machinery, and they were all things that did happen. So the answer will be looking for a non-economic effect rather than for something that was not an effect.

Such non-economic effect is the increase in pollution. It is an environmental effect that might have some very mild economic effects (it might for example decrease tourism), but it's not generally an economic effect.