And unlike a machine, where the y-axis learning value is assumed to be achievable by any machine of a specific class, humans have a much higher degree of variab

And unlike a machine, where the y-axis learning value is assumed to be achievable by any machine of a specific class, humans have a much higher degree of variability. Some will not reach the top of the curve where things level off. Thus a steep learning curve means that a greater percentage of individuals will give up as a result of the more compressed learning requirements.