james_edin said:It helps to ask what evidence would change your mind before you look at any.
Adding the part of the answer the thread has not reached. Whatever the answer turns out to be, the method for getting there is the same: state the assumption, do the arithmetic in public, and invite the correction. That is slower than asserting, and it is the only version that survives being wrong.
I would rather be corrected than agreed with, if it comes to it.