Business is not supposed to be a competition, ones it's taken as a competition there will be hatred among business owners expecially when both are selling the same product in this same line because i have seen business people fighting over this which is not proper. One thing about business is knowing about the business properly and make sure your product is kept in a clean environment, make you products to look more attractive more than others selling same thing and also have a good customer relationship and watch your business grow into something big.
I don't think Competition in business is totally a bad idea, In fact a business should be even competitive but shouldn't be done in a chaotic way rather should be done in improving one relationship with the customers.
When a person happens to create or is surrounded by many people doing the same business as them, what the person should do instead of starting an enmity with the rivals, is to find out what the others lacks and how they treat their customers then he/she do better to attract the customers to himself.
Lets take for instance someone that owns a provision store and sells things, if such person can find an alternative to always have what is being demanded always and treat the customer with respect, many customers will always look forward to purchasing things with you.