How not to lose friends because of the business

In my opinion the difficulties in relations with friends in the business questions arise from the fact that these issues are resolved amicably. I.e. with business partners in business relations there are no problems with friends in a friendly, don't you.
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The fact is that when friends enter into a business relationship, they both hope for a friendly relationship. For example, the party that needs to fulfill some commitments calculates that he will pay more (for example) and that if there is a slight delay in timing, anything terrible will not be — "because we're friends." But at the same time, the other side is counting on the opposite — that the obligations were fulfilled in time and that would have to pay could be less, "because we're friends."
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According to this, I think the most important thing in such matters to say it. To talk and discuss all the nuances. Go out with business partners, we negotiate all the details to chance? Why do friends do this?
When I lend money to an unfamiliar person, I do not forget to specify all the nuances and why would he the money and when he will give them to me, and when borrows a friend, to ask such questions as would be ugly — of course then it turns out that someone is something wrong!
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T. O. that would not lose friends in the business, all the questions you need to discuss out loud and not to rely on telepathy from the other, and to draw his attention that you are not a mind reader. I.e., in cases in which friends need to communicate in business :).

Of course it is better to avoid such options, but if you can, to separate business from life. In the pub you're friends, and in the office everyone has their own position. Although I do not believe in such options.

hmm, Yes, just have to be a normal responsible person and the same from friends require.
So I went to work for his friend. On probation I was not very effective — see for yourself. We talked and I left after the trial period. No one is offended, we perfectly understood each other.

>How to maintain a business relationship with the friends if you can't avoid them? works
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As for me, you must always keep in mind that what you will have to sacrifice or friendship or money. I had such case and such.
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1. To donate money — friendship is always more expensive. And in this case you see that the person also goes in towards you and try to find common ground to resolve the conflict. Then it is a friend, and it is more expensive
(I do not consider here the case when you turn their millions and will do anything for that kind of money. usually such relationships in the money is no longer based on friendship and words, and everything is documented)
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2. To sacrifice the friendship then, and not a friend that was all, and he just always had something from you. You will see, even if just because a person takes a tough stance towards you, does not see his own shortcomings, and only yours, and always talks about the "sense of friendship" (in the first case any words pathetic no, but you can feel it, and then the word drogue through every sentence POPs up)

Not 50/50 but 51/49

Enter into contracts — no problems.

If it is about to start a joint venture with a friend, then there is one way, you need to be 100% sure, or even more, that business will be successful. Otherwise you will lose friends, will find disgruntled/angry partners. And 100% sure in business it is never. The conclusion is obvious.