You conclude, actually, that none of these things have mattered very much. They haven't done a darn thing to the curves. There has been one story, one development in human history that bent the curve, bent it just about 90 degrees, and it is
Se concluye que nada de lo dicho antes ha importado demasiado. No le han tocado un pelo a las curvas. La historia ha sido una, un solo gran desarrollo en la historia de la humanidad modificó la curva unos 90º: