I have to agree with you, trust is the key in achieving a lasting working relationship with someone, be it a friend on not. In a case whereby you are about to start a business, and the only person who can assist you with some of the resources, to work with is someone that you do not trust at all and there is no way around it, would you still go for the business?When you are thinking of starting a business with a friend then trust is the most important thing you will need at this period of time because it is absolutely necessary for you to trust the person you are dealing with in a business but what you have to understand is that 50% of them might not likely to be the same when engaging in business together ,sometimes it can also lead to problems.