That is caleld up-front expenses. Many businesses fail because they do not take into consideration that in the beginning they will be in the red, eg. more out than in. Business will not come to you - as you have probably noticed - unless you are already known. Advertising succes rate, contact callback succes rate varies and you are remarkably succesful if it is above 1% and 5% respectively. (Of course regional and economic conditions can significantly deress even those numbers.) If you have not accounted for that in your business plan, you may be sorely surprised.
Yes you need some money to start a business, this "I don't have any or low overhead" is a pipe dream, but every day someone will think they can strike out own their own, with little or no money, and the larger percent of them fail, a few get lucky, but they usually never earn more then a income at best, and if you try to help them understand the problems, they will tell you how they had a boss that made big bucks or some other yarn, we had a lot of new EC's in the area that looked sucessful, only to learn there wifes that had six figure jobs, and paid for all the nice trucks, all show and no go, they are all gone now since the business slow down, I guess their wife needed the money to run the house, no more playing EC, I my opinion, there is no shortcut to growing a business, find someone that is established, and growing, then follow their model.