Sorry, the speed of light as a limit velocity is not conjecture. It’s proven by Albert Einstein 100 years ago. That question is already settled. See: https://www.newscientist.com/article/2176393-high-speed-electrons-prove-einstein-was-right-about-the-speed-of-light/#:~:text=This%20central%20tenet%20of%20Einstein's,more%20precisely%20than%20ever%20before. 2) Economic models are human constructs but COST of something is not. It’s like BODY SHAPE is a cultural construct but GRAVITY is a global constant and that’s why when we age we start to look the way old folks do look.