Even if we limit our acceptance of finance’s role to being a lubricant of commerce, there are still lots of machines that don’t work, or don’t work well enough to bother with, without lubrication.
A lot of the gains in physical machinery since the 1800s have been about better lubrication permitting more power to be applied more quickly to accomplish the cutting, moving, bending, whatever. Many machines, internal combustion engines for example, would be completely impractical without decent lubrication.
Metaphorically speaking, a lot of the gains in commerce since the 1800s have come from better financial lubrication.
Another thought …
Ultimately, the reason an American worker today is more productive than his/her grandfather is that he has a lot more capital at his disposal. At the limit case, in the old land, labor, and capital triangle the Stone Age folks had to make do with just land & labor. The slow steady accumulation of capital over 20,000 years is the story of Man climbing out of caves.
So the efficient & effective deployment of capital is a key driver of any commerce more complex than Og knapping flint for himself.
Having said that, cocaine can be viewed as a phsychological lubricant. Just one with very bad side effects. Reckless lending & “it won’t happen to me” attitudes to risk can turn finance into the commercial equivalent of cocaine. Everything gets real fast & real fun, and miracles seem not only possible, but to actually be happening all around you.
Then reality reasserts itself, and the low is not only lower than the norm, but feels even worse.
The challenge is to use the cocaine/finance wisely, for the actual lubrication it gives, not for the temporary high.