Before doing negotiation learn first who will we negotiate. find out the likes, hobbies, habits, finances and all things related parties we will negotiate.
Negotiate with all your skills, praise your business opponents, join in activities with him, find any way to attract his attention. Your negotiations will surely succeed.
In negotiations offer the benefits to be gained by your business opponents. Usually they will be interested if you get a lot of profits.
The last attempt when all is not working, invite a more powerful third party to force your business's opponent to accept the negotiation.