We start with the Sales Equation V = need/dream – Effort – Risk – Price, a simple equation, as are the equations of Newton, Bernoulli, Faraday, Clausius and Einstein, equations that changed the world, on which we produced the film La Direzione del Tempo for RAI Cinema. Link to Trailer
But mathematics also allows us to predict the business results of 50, 100, 1,000 salesmen by analysing a statistically significant sample of them, say 20 out of 1,000, drawing the Gaussian curve of their performance.  Then we act on the other 980, first by tightening the Gaussian, i.e. smoothing their working methods, and then, at a later stage, moving it to the right in the graph. It sounds complicated, but it is not if you work with method, mathematical tools and clear ideas.