Answer:
The increase in relative salaries between movie stars and supporting actors over time can be attributed to several factors, including changes in the entertainment industry, the rise of celebrity culture, and the growth of the global film market.
One major factor is the changing nature of the entertainment industry itself. In the early days of Hollywood, movie studios had much more control over the production process and the actors they employed. This meant that salaries were more tightly controlled and there was less room for individual negotiation or bargaining. However, as the industry evolved and became more competitive, actors gained more leverage and were able to demand higher salaries.
Another factor is the rise of celebrity culture, which has led to a greater emphasis on the star power of individual actors. Today, audiences are often drawn to films and shows based on the reputation and popularity of their lead actors, which has created a greater demand for big-name stars and driven up their salaries.
Finally, the growth of the global film market has also contributed to the increase in relative salaries for movie stars. As the film industry has expanded into new markets around the world, there has been a greater demand for high-profile actors who can help sell movies to international audiences. This has created a situation where a small number of elite stars can command very high salaries, while supporting actors may struggle to make a living.