I alwasy wandered what a formula is to hand convert any amount of BTC to USD is based on the variable exchange rate.. what Is it anyhow?
Actually there is no formula. The whole concept is of demand and supply. Suppose buyers agree to give X price and sellers agree to sell at Y price in particular market. So bitcoin price is actually a consensus price between X and Y where both buyer and seller agree to trade.
So this consensus price differs in different market hence we have variable prices across globe.
I disagree to this statement. There will always be a formula to conversions. The digits will not just pop up and there we go, the price is this: $x. If you are telling that the price is to decided by the agreement of both seller and buyer then you are just saying that someone is controlling the price, thus Bitcoin is centralized. It seems that your logic has many flaws.