What is one of David Graeber's key arguments about the emergence of debt and monetary systems; a. The standard account of monetary history is correct, beginning with barter, discovering money, and then developing credit systems. B. By understanding barter, we can fully understand the economic life of a Dutch town in 950 AD and Samarqand in the 4th century BC. C. Because barter is what money-using communities revert to when they have no access to currency D. The standard account of monetary history is backwards, "virtual money" came first, coins came later, unevenly, and never fully replacing credit systems