A factory worker who makes 2x as many widgets doesn't make 2x as much money in my experience in US industry work. The way it typically shakes out is that the workers are part of a union, and the union negotiates compensation and benefits based on length of tenure. In some cases, the factory and union determine a "quota" level of production, and any production in excess of that garners a small bonus. Assuming that 1x is the quota, and the median worker makes $15/hr, producing 2x over the course of a shift might result in an extra $5/hr. Even that number would be higher than I've typically seen.