Historians typically recognizeChinese fire lances , which were invented in the 10 th century , as the first guns . inventedthefirstgun . htm <| sep |> Tienes razon , el aguacate no subio de precio derreepente . Se espera todo el ao para despues subir . <| sep |> i think you ' re GROSSLY overestimating how willing people would be to research for themselves . in the absence of a priceguide , it would just be easier to screw over casual traders , either by selling them items for insane prices , or buying their hot items for low prices , and then flipping them . i agree fully with you that people need to stop treating the document as a gospel though , but the overall impact it has on trading seems positive to me , by protecting average traders and hurting whales .