For simplicity's sake, I call the economy we know to be 'capitalist,' as it is as capitalist as we'll ever know. Governments will always need to purchase/provide goods, and services, as well as intervene in areas where markets fail.
I was looking at it from both sides, and I believe my 'equal society' would be the logical result in both situations.
Really, if a society started that way, I doubt much would change. Any sort of development requiring capital would need many individuals to invest. So, a company that wants to build an office complex would need to reach out to thousands of individuals. But since there would be no financial compensation from the loans, the company would need to provide a pitch, like 'it will provide more jobs' and have to really convince the population.
This would democratize the economy. But then that means people would need to constantly convene, and determine what necessities or infrastructure is to be built. So the aforementioned company would find itself at the mercy of a population that would continuously squabble over what needs to be done or whether the project is worth the long-term monetary loss, without any substantial gain after recouping said loss. The beauty of the current system of lending is that it allows companies and individuals to speculate, and not consult a large swath of the population.
As for the car industry, I doubt there would be one, at all. I would imagine that work would be quite localized, perhaps agricultural. The investment required to build a vehicle is considerable. A community would need to first decide that a vehicle is required. If it is, then money would need to be collected. But even if hundreds paid up, only several people may end up using the vehicle a day. The majority would need to determine if the vehicle, which would be used only by a few, is a worthwhile investment. It would need to raise productivity, or allow for more leisure time. If it offers neither, then no dice.
Anarchists, and Communists believe this to be an idyllic community, and in a lot of ways it is. But realistically, I doubt it would be feasible outside of say, a small village or something like a Kibbutz.