Comparing bitcoin against "offline currencies" you mean to say cash? or a thing that has an economical value like jewelries, mostly with precious gold, silver, bronze, etc? If you are looking for what's the real market of bitcoin, try to check out coinmarketcap.com and for the market value of fiat money/cash, the government or your country will tell it how much it was valued. While with the precious things I mentioned try to explore this chart http://www.kitco.com/charts/