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All business can be profitable depending on the foundation of your business, and also the level of how committed you are to your business.
Before opening a business you'll do some marketing surveying first to know the basic needs and wants of the people in the particular environment you want to do the business. Taking for instance you can't go and sell dried fish in a primary school and expert your business to grow, because in that particular environment the kids in the school don't need them at school, rather you can sell snacks for them, because definitely some will come to school with money for lunch during breake period.
So before doing business you have to have ideas and experiences about it to make sure that your business do not collapse or go bankruptcy.
Unfortunately, this assumption only works under ideal conditions. There are a lot of external and internal factors that can both give explosive growth to a business and stop it altogether.... And the last few years have shown that very well. I think that for the most part we are talking about small and private business, from which many people start their private activity. And it has many peculiarities - from the ability to offer a unique set of goods and services and competitive prices, to the availability of a sufficient target audience with the right level of income to ensure the viability of the business. You will always have expenses on one bowl and income on the other. And the problem is that incorrect business calculations can lead to the fact that you will have guaranteed expenses (rent, salaries, taxes, licenses, electricity, transportation,...) and NEGARANTEE income, or income not exceeding expenses. And if "yesterday" the business had a positive balance, tomorrow it can change its vector. At the same time, it should be remembered that the state helps CROWN business, but it does not care about small business.... Therefore, always calculate, forecast, and what is VERY IMPORTANT - determine the RISKS for business, and their probability. Then it will be easier for you to start and maintain your business.
PS Another interesting but not the easiest approach is to build a well-established business and sell it to competitors
Sometimes it can be VERY profitable