If an individual is capable to run a business by themself, then there is no need to bring in a partner because partners can actually complicate business and make a business not to survive in a long term. A business partnership with an individual who is responsible and matured will be profitable because the other individual will know the importance of what you people are aimed together for and will work for the success of it. But if you become a partner with someone who is immature and has no sense of responsibility the business will surely not last due to break in partnership. Partnership can be the progress or downfall of a business.