"B" is the cost of producing silk with silkworms. SAME whether it's Monster Silk or silkworm silk.
It doesn't matter WHAT number "A" is as long as it is positive (greater than zero). "A" is the difference between the price of high tech fiber or Monster silk and the price of convent-onal silkworm silk. I think that ANYONE would agree that the price of high tech or MS minus conventional silk is going to be positive. Are you going to ask me to prove that as well? Because no, I won't bother. It's so obvious it doesn't need proving.
If I say that B + A > (is greater than) B I do not need to prove or know what number B is. Because it's true for ANY value of B whatsoever!
B = B (VERY basic law of mathematics
Subtract B = B from B + A > B
you get: A > 0 That's true because we said "for any positive number (i.e.: any number greater than zero)
So DEMANDING that I PROVE the value of B is completely and totally irrelevant and a pure distraction. No, I'm NOT going to waste time doing it. EVERYONE ELSE knows it isn't relevant to the point.
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