On the internet, there are full of tech YouTubers and journals that introduce the new technologies and other kinds of stuff which is related to productivity. When they introduce the things sometimes theses graphs are mentioned. Those two graphs are including almost the same data. Its all about GDP aka. Gross domestic product. Its based on the statistics that one nation recorded. Meaning of GDP is simple, in the specific period of time how much that nation turned out the goods and services in terms of market value. Normally its decided with the 1-year term. From here my curiosity born. Actually, before 1600years actual nation incomes and market value, related documents are really hard to get. Even though they can get the documents of tax collector and other kinds of government financial statements (or kingdom financial statements) in those days the economic arithmetic and financial statistics are not well defined. So, personally, I cannot b...