Pareto's Law is a principle proposed by Vilfredo Pareto stating that wealth within a society is not distributed evenly or normally. Instead, it follows a consistent pattern where a small number of people (the 'few') control a large proportion of the wealth, while the vast majority of the population (the 'many') possess very little. The well-known '80-20 rule' is derived from this law. Pareto observed this unequal distribution to be a stable feature across different historical periods and types of economies.