> He is saying as you become more competent using excel, the efficiency increases exponentially.
OK, does this mean anything? How have you quantified efficiency? How have you quantified "learning curve"? What data do you have supporting that the relationship is exponential?
Asking people to say clearly and concretely what they mean is not obtuseness.
Nobody here has been able to elaborate on the initial statement "The efficiency gain vs learning curve is exponential". People are just rewording the sentence slightly and passing that off as an explanation. That seems to indicate that nobody knows what the statement means because the statement is vacuous.
Probably true for smallish values of competency, but it must be logarithmic after that.