Before there was money, there was debt.
Every economics textbook says the same thing: Money was invented to replace onerous and complicated barter systems — to relieve ancient people from having to haul their goods to market. The problem...
http://www.newgeneralservicelist.org/
NEW GENERAL SERVICE LIST PROJECT
the most important words for second language learners of English
a New General Service List (NGSL) of 2818 core high frequency vocabulary words for students of English as a...