Ordinarily, people have been exposed to different data and have acquired different facts along the way. There are always things “on my sheet of paper,” to use a figure of speech, that are not contained on yours, and vice versa. From this information in our possession, each of us will make deductions and conclusions, frame issues, and determine a course of action.
Obviously, if we are working from a different information base, we will end up poles apart. If an approaching conflict is to be minimized, we must be willing to share this knowledge with each other. This would include not just financial details, but relevant ideas, feelings, and needs as well. The only way you can expect someone to understand your point of view is to provide them with the substance from which your outlook was developed. Essentially then, the task is education and not argumentation!