Convincing other people about the products we market is not an easy thing to do and the products we offer must of course be of good quality so that we can offer them to other people. Building a business certainly requires capital and this really depends on the business we are going to build.
That's why there are strategies in marketing and someone has to learn that depending on the experience that he's got.
Aside from the quality, you really have to build network and connection to your future and potential customers and prospects.
No matter what people say, money is always needed in business. Some businesses close just because they do not have enough money to operate anymore even if the concept of the business is good. A good business idea does not always mean it will be profitable immediately.
This is why you should partner up with other people who would be invest in your business. Yes you would be splitting up the profit but at least you’ have enough funding.
Yes it is true in all cases that the more investment in a business the more profit it will make. However it will not end without increasing investment in all established businesses, maybe the scope of the business will not increase. But since the business is dependent on the demand, the demand will also increase as the scope of the business increases. And if it is not possible to supply with the increased demand it will gradually decline. Again even if it is possible to establish a business without capital it will be like 'eating day in and day out'.
No depend on situation since you can sell your idea to some potential clients. That's why there's what we called crowd funding and some businessman want to venture on that since they don't have some funds to use to operate their ideas then convert it as a running business.
There's lot of knowledge can be learn on this video or article
https://www.shopify.com/ph/blog/start-business-without-money so hopefully those people have unique ideas can learn from this and try to work out all their potential plans.
Sometimes its not all about the money but your idea that can solve certain problems in the world since that can be convert into good sales.