When it comes to addressing disease, many industry observers and public health advocates believe that pharmaceutical companies prefer to invest in drugs rather than vaccines, as preventives are ...

Human languages follow a surprising law: the most frequent word is used twice as often as the second, three times as often as the third, and so on. This regularity, called Zipf's law, has just been ...

This paper presents a simple method for calculating deviations between actual city size and the size which would correspond to it with a Pareto exponent equal to one (Zipf's law). The results show two ...

In every language, the most frequent word occurs twice as often as the second most frequent word. This phenomenon called ‘Zipf’s law’ is more than one century old, but until now, scientists have not ...

Disclaimer: This Working Paper should not be reported as representing the views of the IMF.The views expressed in this Working Paper are those of the author(s) and do not necessarily represent those ...

Define a survey measure of brand strength that can be used as a dependent variable against which to model. Define further measures representing factors such as marketing initiatives, touchpoint ...

Economists assume all firms aim to maximize their profits. But the largest and longest-lived companies are not necessarily the most acquisitive, a new mathematical model suggests. Instead they are the ...